251520342 has 16 divisors (see below), whose sum is σ = 503278272. Its totient is φ = 83800520.

The previous prime is 251520337. The next prime is 251520343. The reversal of 251520342 is 243025152.

251520342 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251520343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5773 + ... + 23159.

It is an arithmetic number, because the mean of its divisors is an integer number (31454892).

Almost surely, 2^251520342 is an apocalyptic number.

251520342 is an abundant number, since it is smaller than the sum of its proper divisors (251757930).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

251520342 is a wasteful number, since it uses less digits than its factorization.

251520342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19803.

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 251520342 is about 15859.3928635367. The cubic root of 251520342 is about 631.2349522669.

Adding to 251520342 its reverse (243025152), we get a palindrome (494545494).

The spelling of 251520342 in words is "two hundred fifty-one million, five hundred twenty thousand, three hundred forty-two".