861716025 has 81 divisors (see below), whose sum is σ = 1644906159. Its totient is φ = 431166240.

The previous prime is 861715997. The next prime is 861716027. The reversal of 861716025 is 520617168.

The square root of 861716025 is 29355.

It is a perfect power (a square), and thus also a powerful number.

861716025 is a `hidden beast` number, since 8 + 617 + 16 + 0 + 25 = 666.

It can be written as a sum of positive squares in only one way, i.e., 310217769 + 551498256 = 17613^2 + 23484^2 .

It is not a de Polignac number, because 861716025 - 2²³ = 853327417 is a prime.

It is not an unprimeable number, because it can be changed into a prime (861716027) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 8366124 + ... + 8366226.

Almost surely, 2^861716025 is an apocalyptic number.

861716025 is the 29355-th square number.

861716025 is the 14678-th centered octagonal number.

It is an amenable number.

861716025 is a deficient number, since it is larger than the sum of its proper divisors (783190134).

861716025 is a wasteful number, since it uses less digits than its factorization.

861716025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260 (or 130 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The cubic root of 861716025 is about 951.6006349427.

Multiplying 861716025 by its sum of digits (36), we get a square (31021776900 = 176130²).

It can be divided in two parts, 8617 and 16025, that added together give a palindrome (24642).

The spelling of 861716025 in words is "eight hundred sixty-one million, seven hundred sixteen thousand, twenty-five".