51402501 has 24 divisors (see below), whose sum is σ = 76396320. Its totient is φ = 33286176.

The previous prime is 51402473. The next prime is 51402503. The reversal of 51402501 is 10520415.

It is not a de Polignac number, because 51402501 - 2⁵ = 51402469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51402503) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 122470 + ... + 122888.

It is an arithmetic number, because the mean of its divisors is an integer number (3183180).

Almost surely, 2^51402501 is an apocalyptic number.

It is an amenable number.

51402501 is a deficient number, since it is larger than the sum of its proper divisors (24993819).

51402501 is a wasteful number, since it uses less digits than its factorization.

51402501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 785 (or 782 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 51402501 is about 7169.5537518035. The cubic root of 51402501 is about 371.8160076938.

Adding to 51402501 its reverse (10520415), we get a palindrome (61922916).

The spelling of 51402501 in words is "fifty-one million, four hundred two thousand, five hundred one".