51690939 has 8 divisors (see below), whose sum is σ = 68964672. Its totient is φ = 34438920.

The previous prime is 51690937. The next prime is 51690941. The reversal of 51690939 is 93909615.

It is an interprime number because it is at equal distance from previous prime (51690937) and next prime (51690941).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51690939 - 2¹ = 51690937 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51690939.

It is not an unprimeable number, because it can be changed into a prime (51690937) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1332 + ... + 10254.

It is an arithmetic number, because the mean of its divisors is an integer number (8620584).

Almost surely, 2^51690939 is an apocalyptic number.

51690939 is a deficient number, since it is larger than the sum of its proper divisors (17273733).

51690939 is a wasteful number, since it uses less digits than its factorization.

51690939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10857.

The product of its (nonzero) digits is 65610, while the sum is 42.

The square root of 51690939 is about 7189.6410897902. The cubic root of 51690939 is about 372.5101755399.

The spelling of 51690939 in words is "fifty-one million, six hundred ninety thousand, nine hundred thirty-nine".