861571252 has 6 divisors (see below), whose sum is σ = 1507749698. Its totient is φ = 430785624.

The previous prime is 861571199. The next prime is 861571261. The reversal of 861571252 is 252175168.

It can be written as a sum of positive squares in only one way, i.e., 623301156 + 238270096 = 24966^2 + 15436^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107696403 + ... + 107696410.

Almost surely, 2^861571252 is an apocalyptic number.

It is an amenable number.

861571252 is a deficient number, since it is larger than the sum of its proper divisors (646178446).

861571252 is a wasteful number, since it uses less digits than its factorization.

861571252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215392817 (or 215392815 counting only the distinct ones).

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

The square root of 861571252 is about 29352.5339962328. The cubic root of 861571252 is about 951.5473405895.

The spelling of 861571252 in words is "eight hundred sixty-one million, five hundred seventy-one thousand, two hundred fifty-two".