861138524 has 12 divisors (see below), whose sum is σ = 1521913848. Its totient is φ = 426306000.

The previous prime is 861138521. The next prime is 861138527. The reversal of 861138524 is 425831168.

It is an interprime number because it is at equal distance from previous prime (861138521) and next prime (861138527).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861138521) 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, 1065362 + ... + 1066169.

It is an arithmetic number, because the mean of its divisors is an integer number (126826154).

Almost surely, 2^861138524 is an apocalyptic number.

It is an amenable number.

861138524 is a deficient number, since it is larger than the sum of its proper divisors (660775324).

861138524 is a wasteful number, since it uses less digits than its factorization.

861138524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2131636 (or 2131634 counting only the distinct ones).

The product of its digits is 46080, while the sum is 38.

The square root of 861138524 is about 29345.1618499541. The cubic root of 861138524 is about 951.3880076141.

The spelling of 861138524 in words is "eight hundred sixty-one million, one hundred thirty-eight thousand, five hundred twenty-four".