51006131 has 4 divisors (see below), whose sum is σ = 55643064. Its totient is φ = 46369200.

The previous prime is 51006079. The next prime is 51006143. The reversal of 51006131 is 13160015.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51006131 is a prime.

It is a super-2 number, since 2×51006131² = 5203250799178322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51006181) 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, 2318450 + ... + 2318471.

It is an arithmetic number, because the mean of its divisors is an integer number (13910766).

Almost surely, 2^51006131 is an apocalyptic number.

51006131 is a deficient number, since it is larger than the sum of its proper divisors (4636933).

51006131 is a wasteful number, since it uses less digits than its factorization.

51006131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4636932.

The product of its (nonzero) digits is 90, while the sum is 17.

The square root of 51006131 is about 7141.8576715026. The cubic root of 51006131 is about 370.8578367122.

Adding to 51006131 its reverse (13160015), we get a palindrome (64166146).

The spelling of 51006131 in words is "fifty-one million, six thousand, one hundred thirty-one".