51431407 has 2 divisors, whose sum is σ = 51431408. Its totient is φ = 51431406.

The previous prime is 51431399. The next prime is 51431441. The reversal of 51431407 is 70413415.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51431407 - 2³ = 51431399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51431467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25715703 + 25715704.

It is an arithmetic number, because the mean of its divisors is an integer number (25715704).

Almost surely, 2^51431407 is an apocalyptic number.

51431407 is a deficient number, since it is larger than the sum of its proper divisors (1).

51431407 is an equidigital number, since it uses as much as digits as its factorization.

51431407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 51431407 is about 7171.5693540535. The cubic root of 51431407 is about 371.8856910704.

The spelling of 51431407 in words is "fifty-one million, four hundred thirty-one thousand, four hundred seven".