251533442 has 32 divisors (see below), whose sum is σ = 406715904. Its totient is φ = 116438400.

The previous prime is 251533441. The next prime is 251533453. The reversal of 251533442 is 244335152.

It is a happy number.

251533442 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (251533441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 133793 + ... + 135659.

It is an arithmetic number, because the mean of its divisors is an integer number (12709872).

Almost surely, 2^251533442 is an apocalyptic number.

251533442 is a deficient number, since it is larger than the sum of its proper divisors (155182462).

251533442 is a wasteful number, since it uses less digits than its factorization.

251533442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1994.

The product of its digits is 14400, while the sum is 29.

The square root of 251533442 is about 15859.8058626201. The cubic root of 251533442 is about 631.2459110018.

Adding to 251533442 its reverse (244335152), we get a palindrome (495868594).

The spelling of 251533442 in words is "two hundred fifty-one million, five hundred thirty-three thousand, four hundred forty-two".