51330431 has 2 divisors, whose sum is σ = 51330432. Its totient is φ = 51330430.

The previous prime is 51330427. The next prime is 51330443. The reversal of 51330431 is 13403315.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51330431 - 2² = 51330427 is a prime.

It is a super-2 number, since 2×51330431² = 5269626293291522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51330421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25665215 + 25665216.

It is an arithmetic number, because the mean of its divisors is an integer number (25665216).

Almost surely, 2^51330431 is an apocalyptic number.

51330431 is a deficient number, since it is larger than the sum of its proper divisors (1).

51330431 is an equidigital number, since it uses as much as digits as its factorization.

51330431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 540, while the sum is 20.

The square root of 51330431 is about 7164.5258740548. The cubic root of 51330431 is about 371.6421554973.

Adding to 51330431 its reverse (13403315), we get a palindrome (64733746).

The spelling of 51330431 in words is "fifty-one million, three hundred thirty thousand, four hundred thirty-one".