251321342 has 16 divisors (see below), whose sum is σ = 384578064. Its totient is φ = 123144000.

The previous prime is 251321311. The next prime is 251321347. The reversal of 251321342 is 243123152.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251321347) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30617 + ... + 37947.

It is an arithmetic number, because the mean of its divisors is an integer number (24036129).

Almost surely, 2^251321342 is an apocalyptic number.

251321342 is a deficient number, since it is larger than the sum of its proper divisors (133256722).

251321342 is a wasteful number, since it uses less digits than its factorization.

251321342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7675.

The product of its digits is 1440, while the sum is 23.

The square root of 251321342 is about 15853.1177375304. The cubic root of 251321342 is about 631.0684330665.

Adding to 251321342 its reverse (243123152), we get a palindrome (494444494).

The spelling of 251321342 in words is "two hundred fifty-one million, three hundred twenty-one thousand, three hundred forty-two".