861431248 has 20 divisors (see below), whose sum is σ = 1669706500. Its totient is φ = 430539264.

The previous prime is 861431239. The next prime is 861431281. The reversal of 861431248 is 842134168.

It can be written as a sum of positive squares in 2 ways, for example, as 662959504 + 198471744 = 25748^2 + 14088^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35128 + ... + 54376.

It is an arithmetic number, because the mean of its divisors is an integer number (83485325).

Almost surely, 2^861431248 is an apocalyptic number.

It is an amenable number.

861431248 is a deficient number, since it is larger than the sum of its proper divisors (808275252).

861431248 is a wasteful number, since it uses less digits than its factorization.

861431248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22054 (or 22048 counting only the distinct ones).

The product of its digits is 36864, while the sum is 37.

The square root of 861431248 is about 29350.1490285825. The cubic root of 861431248 is about 951.4957961389.

The spelling of 861431248 in words is "eight hundred sixty-one million, four hundred thirty-one thousand, two hundred forty-eight".