251450042 has 4 divisors (see below), whose sum is σ = 377175066. Its totient is φ = 125725020.

The previous prime is 251450041. The next prime is 251450051. The reversal of 251450042 is 240054152.

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., 242456041 + 8994001 = 15571^2 + 2999^2 .

It is not an unprimeable number, because it can be changed into a prime (251450041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62862509 + ... + 62862512.

Almost surely, 2^251450042 is an apocalyptic number.

251450042 is a deficient number, since it is larger than the sum of its proper divisors (125725024).

251450042 is a wasteful number, since it uses less digits than its factorization.

251450042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125725023.

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 251450042 is about 15857.1763564640. The cubic root of 251450042 is about 631.1761366766.

The spelling of 251450042 in words is "two hundred fifty-one million, four hundred fifty thousand, forty-two".