861307431 has 16 divisors (see below), whose sum is σ = 1220311008. Its totient is φ = 538496000.

The previous prime is 861307417. The next prime is 861307439. The reversal of 861307431 is 134703168.

It is a cyclic number.

It is not a de Polignac number, because 861307431 - 2¹⁵ = 861274663 is a prime.

It is a super-2 number, since 2×861307431² = 1483700981391639522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 861307392 and 861307401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861307439) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15720 + ... + 44381.

It is an arithmetic number, because the mean of its divisors is an integer number (76269438).

Almost surely, 2^861307431 is an apocalyptic number.

861307431 is a deficient number, since it is larger than the sum of its proper divisors (359003577).

861307431 is a wasteful number, since it uses less digits than its factorization.

861307431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60402.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 861307431 is about 29348.0396449235. The cubic root of 861307431 is about 951.4502065072.

The spelling of 861307431 in words is "eight hundred sixty-one million, three hundred seven thousand, four hundred thirty-one".