247211217 has 16 divisors (see below), whose sum is σ = 399533760. Its totient is φ = 149824800.

The previous prime is 247211213. The next prime is 247211221. The reversal of 247211217 is 712112742.

It is a happy number.

247211217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (247211213) and next prime (247211221).

It is not a de Polignac number, because 247211217 - 2² = 247211213 is a prime.

It is a super-2 number, since 2×247211217² = 122226771621242178, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (247211213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 415884 + ... + 416477.

It is an arithmetic number, because the mean of its divisors is an integer number (24970860).

Almost surely, 2^247211217 is an apocalyptic number.

247211217 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

247211217 is a deficient number, since it is larger than the sum of its proper divisors (152322543).

247211217 is a wasteful number, since it uses less digits than its factorization.

247211217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 832381 (or 832375 counting only the distinct ones).

The product of its digits is 1568, while the sum is 27.

The square root of 247211217 is about 15722.9519174995. The cubic root of 247211217 is about 627.6093295850.

Adding to 247211217 its reverse (712112742), we get a palindrome (959323959).

It can be divided in two parts, 2472 and 11217, that added together give a square (13689 = 117²).

The spelling of 247211217 in words is "two hundred forty-seven million, two hundred eleven thousand, two hundred seventeen".