251355342 has 64 divisors (see below), whose sum is σ = 590413824. Its totient is φ = 69850080.

The previous prime is 251355337. The next prime is 251355359. The reversal of 251355342 is 243553152.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 439917 + ... + 440487.

It is an arithmetic number, because the mean of its divisors is an integer number (9225216).

Almost surely, 2^251355342 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 251355342, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (295206912).

251355342 is an abundant number, since it is smaller than the sum of its proper divisors (339058482).

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

251355342 is a wasteful number, since it uses less digits than its factorization.

251355342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 853.

The product of its digits is 18000, while the sum is 30.

The square root of 251355342 is about 15854.1900455369. The cubic root of 251355342 is about 631.0968898078.

The spelling of 251355342 in words is "two hundred fifty-one million, three hundred fifty-five thousand, three hundred forty-two".