861157225 has 24 divisors (see below), whose sum is σ = 1093055040. Its totient is φ = 672840000.

The previous prime is 861157207. The next prime is 861157243. The reversal of 861157225 is 522751168.

It is an interprime number because it is at equal distance from previous prime (861157207) and next prime (861157243).

It is not a de Polignac number, because 861157225 - 2¹¹ = 861155177 is a prime.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 191250 + ... + 195700.

It is an arithmetic number, because the mean of its divisors is an integer number (45543960).

Almost surely, 2^861157225 is an apocalyptic number.

It is an amenable number.

861157225 is a deficient number, since it is larger than the sum of its proper divisors (231897815).

861157225 is a wasteful number, since it uses less digits than its factorization.

861157225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4641 (or 4636 counting only the distinct ones).

The product of its digits is 33600, while the sum is 37.

The square root of 861157225 is about 29345.4804867802. The cubic root of 861157225 is about 951.3948945349.

The spelling of 861157225 in words is "eight hundred sixty-one million, one hundred fifty-seven thousand, two hundred twenty-five".