51040931 has 2 divisors, whose sum is σ = 51040932. Its totient is φ = 51040930.

The previous prime is 51040889. The next prime is 51040949. The reversal of 51040931 is 13904015.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51040931 is a prime.

It is a super-2 number, since 2×51040931² = 5210353274693522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51040897 and 51040906.

It is not a weakly prime, because it can be changed into another prime (51040981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25520465 + 25520466.

It is an arithmetic number, because the mean of its divisors is an integer number (25520466).

Almost surely, 2^51040931 is an apocalyptic number.

51040931 is a deficient number, since it is larger than the sum of its proper divisors (1).

51040931 is an equidigital number, since it uses as much as digits as its factorization.

51040931 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 23.

The square root of 51040931 is about 7144.2935969905. The cubic root of 51040931 is about 370.9421593774.

Adding to 51040931 its reverse (13904015), we get a palindrome (64944946).

The spelling of 51040931 in words is "fifty-one million, forty thousand, nine hundred thirty-one".