251495121953 has 2 divisors, whose sum is σ = 251495121954. Its totient is φ = 251495121952.

The previous prime is 251495121931. The next prime is 251495121991. The reversal of 251495121953 is 359121594152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 136361809984 + 115133311969 = 369272^2 + 339313^2 .

It is a cyclic number.

It is not a de Polignac number, because 251495121953 - 2⁸ = 251495121697 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 251495121898 and 251495121907.

It is not a weakly prime, because it can be changed into another prime (251495121923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125747560976 + 125747560977.

It is an arithmetic number, because the mean of its divisors is an integer number (125747560977).

Almost surely, 2^251495121953 is an apocalyptic number.

It is an amenable number.

251495121953 is a deficient number, since it is larger than the sum of its proper divisors (1).

251495121953 is an equidigital number, since it uses as much as digits as its factorization.

251495121953 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 486000, while the sum is 47.

The spelling of 251495121953 in words is "two hundred fifty-one billion, four hundred ninety-five million, one hundred twenty-one thousand, nine hundred fifty-three".