251373532261 has 2 divisors, whose sum is σ = 251373532262. Its totient is φ = 251373532260.

The previous prime is 251373532259. The next prime is 251373532327. The reversal of 251373532261 is 162235373152.

It is a happy number.

251373532261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 250394155236 + 979377025 = 500394^2 + 31295^2 .

It is a cyclic number.

It is not a de Polignac number, because 251373532261 - 2¹ = 251373532259 is a prime.

Together with 251373532259, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251373532061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125686766130 + 125686766131.

It is an arithmetic number, because the mean of its divisors is an integer number (125686766131).

Almost surely, 2^251373532261 is an apocalyptic number.

It is an amenable number.

251373532261 is a deficient number, since it is larger than the sum of its proper divisors (1).

251373532261 is an equidigital number, since it uses as much as digits as its factorization.

251373532261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 226800, while the sum is 40.

The spelling of 251373532261 in words is "two hundred fifty-one billion, three hundred seventy-three million, five hundred thirty-two thousand, two hundred sixty-one".