251341154261 has 2 divisors, whose sum is σ = 251341154262. Its totient is φ = 251341154260.

The previous prime is 251341154249. The next prime is 251341154263. The reversal of 251341154261 is 162451143152.

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., 246700956100 + 4640198161 = 496690^2 + 68119^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251341154261 is a prime.

It is a super-2 number, since 2×251341154261² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 251341154263, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251341154263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125670577130 + 125670577131.

It is an arithmetic number, because the mean of its divisors is an integer number (125670577131).

Almost surely, 2^251341154261 is an apocalyptic number.

It is an amenable number.

251341154261 is a deficient number, since it is larger than the sum of its proper divisors (1).

251341154261 is an equidigital number, since it uses as much as digits as its factorization.

251341154261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28800, while the sum is 35.

The spelling of 251341154261 in words is "two hundred fifty-one billion, three hundred forty-one million, one hundred fifty-four thousand, two hundred sixty-one".