251442361 has 2 divisors, whose sum is σ = 251442362. Its totient is φ = 251442360.

The previous prime is 251442337. The next prime is 251442397. The reversal of 251442361 is 163244152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 222755625 + 28686736 = 14925^2 + 5356^2 .

It is a cyclic number.

It is not a de Polignac number, because 251442361 - 2²³ = 243053753 is a prime.

It is a super-3 number, since 3×251442361³ (a number of 26 digits) contains 333 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (251448361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125721180 + 125721181.

It is an arithmetic number, because the mean of its divisors is an integer number (125721181).

Almost surely, 2^251442361 is an apocalyptic number.

It is an amenable number.

251442361 is a deficient number, since it is larger than the sum of its proper divisors (1).

251442361 is an equidigital number, since it uses as much as digits as its factorization.

251442361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5760, while the sum is 28.

The square root of 251442361 is about 15856.9341614323. The cubic root of 251442361 is about 631.1697098025.

The spelling of 251442361 in words is "two hundred fifty-one million, four hundred forty-two thousand, three hundred sixty-one".