51999958 has 16 divisors (see below), whose sum is σ = 83295360. Its totient is φ = 24292800.

The previous prime is 51999919. The next prime is 51999971. The reversal of 51999958 is 85999915.

It is a junction number, because it is equal to n+sod(n) for n = 51999899 and 51999908.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12663 + ... + 16258.

It is an arithmetic number, because the mean of its divisors is an integer number (5205960).

Almost surely, 2^51999958 is an apocalyptic number.

51999958 is a gapful number since it is divisible by the number (58) formed by its first and last digit.

51999958 is a deficient number, since it is larger than the sum of its proper divisors (31295402).

51999958 is a wasteful number, since it uses less digits than its factorization.

51999958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28983.

The product of its digits is 1312200, while the sum is 55.

The square root of 51999958 is about 7211.0996387514. The cubic root of 51999958 is about 373.2510151910.

The spelling of 51999958 in words is "fifty-one million, nine hundred ninety-nine thousand, nine hundred fifty-eight".