251231242 has 4 divisors (see below), whose sum is σ = 376846866. Its totient is φ = 125615620.

The previous prime is 251231237. The next prime is 251231311. The reversal of 251231242 is 242132152.

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., 189310081 + 61921161 = 13759^2 + 7869^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62807809 + ... + 62807812.

Almost surely, 2^251231242 is an apocalyptic number.

251231242 is a deficient number, since it is larger than the sum of its proper divisors (125615624).

251231242 is a wasteful number, since it uses less digits than its factorization.

251231242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125615623.

The product of its digits is 960, while the sum is 22.

The square root of 251231242 is about 15850.2757704716. The cubic root of 251231242 is about 630.9930102877.

Adding to 251231242 its reverse (242132152), we get a palindrome (493363394).

The spelling of 251231242 in words is "two hundred fifty-one million, two hundred thirty-one thousand, two hundred forty-two".