251261342 has 16 divisors (see below), whose sum is σ = 385819200. Its totient is φ = 122667648.

The previous prime is 251261327. The next prime is 251261347. The reversal of 251261342 is 243162152.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251261347) 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 in 7 ways as a sum of consecutive naturals, for example, 40034 + ... + 45882.

It is an arithmetic number, because the mean of its divisors is an integer number (24113700).

Almost surely, 2^251261342 is an apocalyptic number.

251261342 is a deficient number, since it is larger than the sum of its proper divisors (134557858).

251261342 is a wasteful number, since it uses less digits than its factorization.

251261342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6355.

The product of its digits is 2880, while the sum is 26.

The square root of 251261342 is about 15851.2252523267. The cubic root of 251261342 is about 631.0182090263.

The spelling of 251261342 in words is "two hundred fifty-one million, two hundred sixty-one thousand, three hundred forty-two".