251432042 has 4 divisors (see below), whose sum is σ = 377148066. Its totient is φ = 125716020.

The previous prime is 251432029. The next prime is 251432081. The reversal of 251432042 is 240234152.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 146143921 + 105288121 = 12089^2 + 10261^2 .

It is a junction number, because it is equal to n+sod(n) for n = 251431999 and 251432017.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62858009 + ... + 62858012.

Almost surely, 2^251432042 is an apocalyptic number.

251432042 is a deficient number, since it is larger than the sum of its proper divisors (125716024).

251432042 is a wasteful number, since it uses less digits than its factorization.

251432042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125716023.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 251432042 is about 15856.6087799378. The cubic root of 251432042 is about 631.1610754455.

Adding to 251432042 its reverse (240234152), we get a palindrome (491666194).

The spelling of 251432042 in words is "two hundred fifty-one million, four hundred thirty-two thousand, forty-two".