51005131 has 4 divisors (see below), whose sum is σ = 51045064. Its totient is φ = 50965200.

The previous prime is 51005057. The next prime is 51005167. The reversal of 51005131 is 13150015.

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

It is a cyclic number.

It is not a de Polignac number, because 51005131 - 2⁹ = 51004619 is a prime.

It is a super-2 number, since 2×51005131² = 5203046776654322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51009131) 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, 17985 + ... + 20626.

It is an arithmetic number, because the mean of its divisors is an integer number (12761266).

Almost surely, 2^51005131 is an apocalyptic number.

51005131 is a deficient number, since it is larger than the sum of its proper divisors (39933).

51005131 is a wasteful number, since it uses less digits than its factorization.

51005131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39932.

The product of its (nonzero) digits is 75, while the sum is 16.

The square root of 51005131 is about 7141.7876613632. The cubic root of 51005131 is about 370.8554130803.

Adding to 51005131 its reverse (13150015), we get a palindrome (64155146).

The spelling of 51005131 in words is "fifty-one million, five thousand, one hundred thirty-one".