251540310551 has 2 divisors, whose sum is σ = 251540310552. Its totient is φ = 251540310550.

The previous prime is 251540310499. The next prime is 251540310563. The reversal of 251540310551 is 155013045152.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 251540310551 - 2¹⁸ = 251540048407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251540300551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125770155275 + 125770155276.

It is an arithmetic number, because the mean of its divisors is an integer number (125770155276).

Almost surely, 2^251540310551 is an apocalyptic number.

251540310551 is a deficient number, since it is larger than the sum of its proper divisors (1).

251540310551 is an equidigital number, since it uses as much as digits as its factorization.

251540310551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15000, while the sum is 32.

The spelling of 251540310551 in words is "two hundred fifty-one billion, five hundred forty million, three hundred ten thousand, five hundred fifty-one".