251350042 has 4 divisors (see below), whose sum is σ = 377025066. Its totient is φ = 125675020.

The previous prime is 251350039. The next prime is 251350067. The reversal of 251350042 is 240053152.

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., 150528361 + 100821681 = 12269^2 + 10041^2 .

It is a super-2 number, since 2×251350042² = 126353687226803528, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 251349995 and 251350022.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62837509 + ... + 62837512.

Almost surely, 2^251350042 is an apocalyptic number.

251350042 is a deficient number, since it is larger than the sum of its proper divisors (125675024).

251350042 is a wasteful number, since it uses less digits than its factorization.

251350042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125675023.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 251350042 is about 15854.0228964134. The cubic root of 251350042 is about 631.0924540729.

The spelling of 251350042 in words is "two hundred fifty-one million, three hundred fifty thousand, forty-two".