247472161 has 4 divisors (see below), whose sum is σ = 250604800. Its totient is φ = 244339524.

The previous prime is 247472153. The next prime is 247472189. The reversal of 247472161 is 161274742.

It is a happy number.

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 247472161 - 2³ = 247472153 is a prime.

It is a super-2 number, since 2×247472161² = 122484940940019842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (247470161) 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, 1566201 + ... + 1566358.

It is an arithmetic number, because the mean of its divisors is an integer number (62651200).

Almost surely, 2^247472161 is an apocalyptic number.

It is an amenable number.

247472161 is a deficient number, since it is larger than the sum of its proper divisors (3132639).

247472161 is an equidigital number, since it uses as much as digits as its factorization.

247472161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3132638.

The product of its digits is 18816, while the sum is 34.

The square root of 247472161 is about 15731.2479161699. The cubic root of 247472161 is about 627.8300764452.

The spelling of 247472161 in words is "two hundred forty-seven million, four hundred seventy-two thousand, one hundred sixty-one".