251203039121 has 2 divisors, whose sum is σ = 251203039122. Its totient is φ = 251203039120.

The previous prime is 251203039091. The next prime is 251203039123. The reversal of 251203039121 is 121930302152.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 246970235521 + 4232803600 = 496961^2 + 65060^2 .

It is a cyclic number.

It is not a de Polignac number, because 251203039121 - 2²² = 251198844817 is a prime.

Together with 251203039123, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (251203039123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125601519560 + 125601519561.

It is an arithmetic number, because the mean of its divisors is an integer number (125601519561).

Almost surely, 2^251203039121 is an apocalyptic number.

It is an amenable number.

251203039121 is a deficient number, since it is larger than the sum of its proper divisors (1).

251203039121 is an equidigital number, since it uses as much as digits as its factorization.

251203039121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 29.

The spelling of 251203039121 in words is "two hundred fifty-one billion, two hundred three million, thirty-nine thousand, one hundred twenty-one".