861952025 has 24 divisors (see below), whose sum is σ = 1216689984. Its totient is φ = 599614400.

The previous prime is 861952019. The next prime is 861952057. The reversal of 861952025 is 520259168.

861952025 = T₈₆₄₆ + T₈₆₄₇ + ... + T₈₆₆₈.

It is not a de Polignac number, because 861952025 - 2¹² = 861947929 is a prime.

It is a super-2 number, since 2×861952025² = 1485922586803201250, which contains 22 as substring.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 861952025.

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, 61814 + ... + 74463.

It is an arithmetic number, because the mean of its divisors is an integer number (50695416).

Almost surely, 2^861952025 is an apocalyptic number.

It is an amenable number.

861952025 is a deficient number, since it is larger than the sum of its proper divisors (354737959).

861952025 is a wasteful number, since it uses less digits than its factorization.

861952025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136321 (or 136316 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 861952025 is about 29359.0194829460. The cubic root of 861952025 is about 951.6874993097.

The spelling of 861952025 in words is "eight hundred sixty-one million, nine hundred fifty-two thousand, twenty-five".