47217997 has 4 divisors (see below), whose sum is σ = 47314656. Its totient is φ = 47121340.

The previous prime is 47217977. The next prime is 47218001. The reversal of 47217997 is 79971274.

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 a de Polignac number, because none of the positive numbers 2^k-47217997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47217917) 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, 47593 + ... + 48574.

It is an arithmetic number, because the mean of its divisors is an integer number (11828664).

Almost surely, 2^47217997 is an apocalyptic number.

It is an amenable number.

47217997 is a deficient number, since it is larger than the sum of its proper divisors (96659).

47217997 is an equidigital number, since it uses as much as digits as its factorization.

47217997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96658.

The product of its digits is 222264, while the sum is 46.

The square root of 47217997 is about 6871.5352724118. The cubic root of 47217997 is about 361.4397002575.

The spelling of 47217997 in words is "forty-seven million, two hundred seventeen thousand, nine hundred ninety-seven".