247486813 has 4 divisors (see below), whose sum is σ = 282842080. Its totient is φ = 212131548.

The previous prime is 247486807. The next prime is 247486829. The reversal of 247486813 is 318684742.

247486813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 247486813 - 2⁵ = 247486781 is a prime.

It is a super-2 number, since 2×247486813² = 122499445217793938, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 247486813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247486313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17677623 + ... + 17677636.

It is an arithmetic number, because the mean of its divisors is an integer number (70710520).

Almost surely, 2^247486813 is an apocalyptic number.

It is an amenable number.

247486813 is a deficient number, since it is larger than the sum of its proper divisors (35355267).

247486813 is an equidigital number, since it uses as much as digits as its factorization.

247486813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35355266.

The product of its digits is 258048, while the sum is 43.

The square root of 247486813 is about 15731.7136065973. The cubic root of 247486813 is about 627.8424667745.

The spelling of 247486813 in words is "two hundred forty-seven million, four hundred eighty-six thousand, eight hundred thirteen".