51136505 has 32 divisors (see below), whose sum is σ = 74511360. Its totient is φ = 32909760.

The previous prime is 51136487. The next prime is 51136507. The reversal of 51136505 is 50563115.

It is not a de Polignac number, because 51136505 - 2⁸ = 51136249 is a prime.

It is a super-2 number, since 2×51136505² = 5229884287230050, which contains 22 as substring.

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 31 ways as a sum of consecutive naturals, for example, 86822 + ... + 87408.

It is an arithmetic number, because the mean of its divisors is an integer number (2328480).

Almost surely, 2^51136505 is an apocalyptic number.

It is an amenable number.

51136505 is a deficient number, since it is larger than the sum of its proper divisors (23374855).

51136505 is a wasteful number, since it uses less digits than its factorization.

51136505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 749.

The product of its (nonzero) digits is 2250, while the sum is 26.

The square root of 51136505 is about 7150.9793035640. The cubic root of 51136505 is about 371.1735443989.

The spelling of 51136505 in words is "fifty-one million, one hundred thirty-six thousand, five hundred five".