251261141 has 2 divisors, whose sum is σ = 251261142. Its totient is φ = 251261140.

The previous prime is 251261093. The next prime is 251261147. The reversal of 251261141 is 141162152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 131446225 + 119814916 = 11465^2 + 10946^2 .

It is a cyclic number.

It is not a de Polignac number, because 251261141 - 2¹⁸ = 250998997 is a prime.

It is a Sophie Germain 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 (251261147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125630570 + 125630571.

It is an arithmetic number, because the mean of its divisors is an integer number (125630571).

Almost surely, 2^251261141 is an apocalyptic number.

It is an amenable number.

251261141 is a deficient number, since it is larger than the sum of its proper divisors (1).

251261141 is an equidigital number, since it uses as much as digits as its factorization.

251261141 is an evil number, because the sum of its binary digits is even.

The product of its digits is 480, while the sum is 23.

The square root of 251261141 is about 15851.2189121216. The cubic root of 251261141 is about 631.0180407623.

The spelling of 251261141 in words is "two hundred fifty-one million, two hundred sixty-one thousand, one hundred forty-one".