51139523 has 2 divisors, whose sum is σ = 51139524. Its totient is φ = 51139522.

The previous prime is 51139481. The next prime is 51139531. The reversal of 51139523 is 32593115.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51139523 is a prime.

It is not a weakly prime, because it can be changed into another prime (51139573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25569761 + 25569762.

It is an arithmetic number, because the mean of its divisors is an integer number (25569762).

Almost surely, 2^51139523 is an apocalyptic number.

51139523 is a deficient number, since it is larger than the sum of its proper divisors (1).

51139523 is an equidigital number, since it uses as much as digits as its factorization.

51139523 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4050, while the sum is 29.

The square root of 51139523 is about 7151.1903204991. The cubic root of 51139523 is about 371.1808462909.

The spelling of 51139523 in words is "fifty-one million, one hundred thirty-nine thousand, five hundred twenty-three".