51440487359 has 2 divisors, whose sum is σ = 51440487360. Its totient is φ = 51440487358.

The previous prime is 51440487331. The next prime is 51440487379. The reversal of 51440487359 is 95378404415.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51440487359 is a prime.

It is a super-2 number, since 2×51440487359² (a number of 22 digits) contains 22 as substring.

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 (51440487379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25720243679 + 25720243680.

It is an arithmetic number, because the mean of its divisors is an integer number (25720243680).

Almost surely, 2^51440487359 is an apocalyptic number.

51440487359 is a deficient number, since it is larger than the sum of its proper divisors (1).

51440487359 is an equidigital number, since it uses as much as digits as its factorization.

51440487359 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2419200, while the sum is 50.

The spelling of 51440487359 in words is "fifty-one billion, four hundred forty million, four hundred eighty-seven thousand, three hundred fifty-nine".