51031439 has 2 divisors, whose sum is σ = 51031440. Its totient is φ = 51031438.

The previous prime is 51031423. The next prime is 51031447. The reversal of 51031439 is 93413015.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51031439 - 2⁴ = 51031423 is a prime.

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 (51031489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25515719 + 25515720.

It is an arithmetic number, because the mean of its divisors is an integer number (25515720).

Almost surely, 2^51031439 is an apocalyptic number.

51031439 is a deficient number, since it is larger than the sum of its proper divisors (1).

51031439 is an equidigital number, since it uses as much as digits as its factorization.

51031439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 51031439 is about 7143.6292596971. The cubic root of 51031439 is about 370.9191634459.

The spelling of 51031439 in words is "fifty-one million, thirty-one thousand, four hundred thirty-nine".