51555131 has 2 divisors, whose sum is σ = 51555132. Its totient is φ = 51555130.

The previous prime is 51555109. The next prime is 51555137. The reversal of 51555131 is 13155515.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51555131 is a prime.

It is a super-2 number, since 2×51555131² = 5315863064854322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51555131.

It is not a weakly prime, because it can be changed into another prime (51555137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25777565 + 25777566.

It is an arithmetic number, because the mean of its divisors is an integer number (25777566).

Almost surely, 2^51555131 is an apocalyptic number.

51555131 is a deficient number, since it is larger than the sum of its proper divisors (1).

51555131 is an equidigital number, since it uses as much as digits as its factorization.

51555131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1875, while the sum is 26.

The square root of 51555131 is about 7180.1901785398. The cubic root of 51555131 is about 372.1836564715.

The spelling of 51555131 in words is "fifty-one million, five hundred fifty-five thousand, one hundred thirty-one".