51330031 has 2 divisors, whose sum is σ = 51330032. Its totient is φ = 51330030.

The previous prime is 51330007. The next prime is 51330049. The reversal of 51330031 is 13003315.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51330031 - 2¹³ = 51321839 is a prime.

It is a super-2 number, since 2×51330031² = 5269544164921922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51329987 and 51330014.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51330061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25665015 + 25665016.

It is an arithmetic number, because the mean of its divisors is an integer number (25665016).

Almost surely, 2^51330031 is an apocalyptic number.

51330031 is a deficient number, since it is larger than the sum of its proper divisors (1).

51330031 is an equidigital number, since it uses as much as digits as its factorization.

51330031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 135, while the sum is 16.

The square root of 51330031 is about 7164.4979586849. The cubic root of 51330031 is about 371.6411901359.

Adding to 51330031 its reverse (13003315), we get a palindrome (64333346).

The spelling of 51330031 in words is "fifty-one million, three hundred thirty thousand, thirty-one".