51091719923 has 2 divisors, whose sum is σ = 51091719924. Its totient is φ = 51091719922.

The previous prime is 51091719871. The next prime is 51091720067. The reversal of 51091719923 is 32991719015.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51091719923 - 2⁸ = 51091719667 is a prime.

It is a super-2 number, since 2×51091719923² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51091719023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25545859961 + 25545859962.

It is an arithmetic number, because the mean of its divisors is an integer number (25545859962).

Almost surely, 2^51091719923 is an apocalyptic number.

51091719923 is a deficient number, since it is larger than the sum of its proper divisors (1).

51091719923 is an equidigital number, since it uses as much as digits as its factorization.

51091719923 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 153090, while the sum is 47.

The spelling of 51091719923 in words is "fifty-one billion, ninety-one million, seven hundred nineteen thousand, nine hundred twenty-three".