51245431 has 2 divisors, whose sum is σ = 51245432. Its totient is φ = 51245430.

The previous prime is 51245423. The next prime is 51245437. The reversal of 51245431 is 13454215.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51245431 - 2³ = 51245423 is a prime.

It is a super-2 number, since 2×51245431² = 5252188396751522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51245396 and 51245405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51245437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25622715 + 25622716.

It is an arithmetic number, because the mean of its divisors is an integer number (25622716).

Almost surely, 2^51245431 is an apocalyptic number.

51245431 is a deficient number, since it is larger than the sum of its proper divisors (1).

51245431 is an equidigital number, since it uses as much as digits as its factorization.

51245431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2400, while the sum is 25.

The square root of 51245431 is about 7158.5914117234. The cubic root of 51245431 is about 371.4369033986.

Adding to 51245431 its reverse (13454215), we get a palindrome (64699646).

The spelling of 51245431 in words is "fifty-one million, two hundred forty-five thousand, four hundred thirty-one".