251461141609 has 2 divisors, whose sum is σ = 251461141610. Its totient is φ = 251461141608.

The previous prime is 251461141601. The next prime is 251461141787. The reversal of 251461141609 is 906141164152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 162895381609 + 88565760000 = 403603^2 + 297600^2 .

It is a cyclic number.

It is not a de Polignac number, because 251461141609 - 2³ = 251461141601 is a prime.

It is a super-2 number, since 2×251461141609² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (251461141601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125730570804 + 125730570805.

It is an arithmetic number, because the mean of its divisors is an integer number (125730570805).

Almost surely, 2^251461141609 is an apocalyptic number.

It is an amenable number.

251461141609 is a deficient number, since it is larger than the sum of its proper divisors (1).

251461141609 is an equidigital number, since it uses as much as digits as its factorization.

251461141609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 40.

The spelling of 251461141609 in words is "two hundred fifty-one billion, four hundred sixty-one million, one hundred forty-one thousand, six hundred nine".