51690942 has 12 divisors (see below), whose sum is σ = 111997080. Its totient is φ = 17230308.

The previous prime is 51690941. The next prime is 51690943. The reversal of 51690942 is 24909615.

It is an interprime number because it is at equal distance from previous prime (51690941) and next prime (51690943).

It is a junction number, because it is equal to n+sod(n) for n = 51690897 and 51690906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51690941) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1435842 + ... + 1435877.

It is an arithmetic number, because the mean of its divisors is an integer number (9333090).

Almost surely, 2^51690942 is an apocalyptic number.

51690942 is an abundant number, since it is smaller than the sum of its proper divisors (60306138).

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

51690942 is a wasteful number, since it uses less digits than its factorization.

51690942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2871727 (or 2871724 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 51690942 is about 7189.6412984237. The cubic root of 51690942 is about 372.5101827464.

The spelling of 51690942 in words is "fifty-one million, six hundred ninety thousand, nine hundred forty-two".