51136501 has 4 divisors (see below), whose sum is σ = 55070092. Its totient is φ = 47202912.

The previous prime is 51136487. The next prime is 51136507. The reversal of 51136501 is 10563115.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 33074001 + 18062500 = 5751^2 + 4250^2 .

It is a cyclic number.

It is not a de Polignac number, because 51136501 - 2¹⁷ = 51005429 is a prime.

It is a super-2 number, since 2×51136501² = 5229883469046002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51136507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1966776 + ... + 1966801.

It is an arithmetic number, because the mean of its divisors is an integer number (13767523).

Almost surely, 2^51136501 is an apocalyptic number.

It is an amenable number.

51136501 is a deficient number, since it is larger than the sum of its proper divisors (3933591).

51136501 is a wasteful number, since it uses less digits than its factorization.

51136501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3933590.

The product of its (nonzero) digits is 450, while the sum is 22.

The square root of 51136501 is about 7150.9790238820. The cubic root of 51136501 is about 371.1735347209.

Adding to 51136501 its reverse (10563115), we get a palindrome (61699616).

The spelling of 51136501 in words is "fifty-one million, one hundred thirty-six thousand, five hundred one".