51999950 has 12 divisors (see below), whose sum is σ = 96720000. Its totient is φ = 20799960.

The previous prime is 51999919. The next prime is 51999971. The reversal of 51999950 is 5999915.

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 51999895 and 51999904.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 519950 + ... + 520049.

It is an arithmetic number, because the mean of its divisors is an integer number (8060000).

Almost surely, 2^51999950 is an apocalyptic number.

51999950 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

51999950 is a deficient number, since it is larger than the sum of its proper divisors (44720050).

51999950 is a wasteful number, since it uses less digits than its factorization.

51999950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1040011 (or 1040006 counting only the distinct ones).

The product of its (nonzero) digits is 164025, while the sum is 47.

The square root of 51999950 is about 7211.0990840509. The cubic root of 51999950 is about 373.2509960499.

It can be divided in two parts, 51 and 999950, that added together give a palindrome (1000001).

The spelling of 51999950 in words is "fifty-one million, nine hundred ninety-nine thousand, nine hundred fifty".