861510942 has 24 divisors (see below), whose sum is σ = 1912135680. Its totient is φ = 280165920.

The previous prime is 861510883. The next prime is 861510953. The reversal of 861510942 is 249015168.

It is a super-2 number, since 2×861510942² = 1484402206371454728, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 861510897 and 861510906.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 582942 + ... + 584417.

It is an arithmetic number, because the mean of its divisors is an integer number (79672320).

Almost surely, 2^861510942 is an apocalyptic number.

861510942 is a gapful number since it is divisible by the number (82) formed by its first and last digit.

861510942 is an abundant number, since it is smaller than the sum of its proper divisors (1050624738).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

861510942 is a wasteful number, since it uses less digits than its factorization.

861510942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1167408 (or 1167405 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 861510942 is about 29351.5066393533. The cubic root of 861510942 is about 951.5251372956.

The spelling of 861510942 in words is "eight hundred sixty-one million, five hundred ten thousand, nine hundred forty-two".