251542434 has 32 divisors (see below), whose sum is σ = 591038784. Its totient is φ = 70361280.

The previous prime is 251542409. The next prime is 251542441. The reversal of 251542434 is 434245152.

251542434 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×251542434² = 126547192205288712, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 145729 + ... + 147444.

It is an arithmetic number, because the mean of its divisors is an integer number (18469962).

Almost surely, 2^251542434 is an apocalyptic number.

251542434 is an abundant number, since it is smaller than the sum of its proper divisors (339496350).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

251542434 is a wasteful number, since it uses less digits than its factorization.

251542434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293202.

The product of its digits is 19200, while the sum is 30.

The square root of 251542434 is about 15860.0893440106. The cubic root of 251542434 is about 631.2534329912.

Adding to 251542434 its reverse (434245152), we get a palindrome (685787586).

The spelling of 251542434 in words is "two hundred fifty-one million, five hundred forty-two thousand, four hundred thirty-four".