251641086 has 16 divisors (see below), whose sum is σ = 508471824. Its totient is φ = 83015424.

The previous prime is 251641069. The next prime is 251641087. The reversal of 251641086 is 680146152.

251641086 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251641087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 215605 + ... + 216768.

It is an arithmetic number, because the mean of its divisors is an integer number (31779489).

Almost surely, 2^251641086 is an apocalyptic number.

251641086 is an abundant number, since it is smaller than the sum of its proper divisors (256830738).

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

251641086 is a wasteful number, since it uses less digits than its factorization.

251641086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432475.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 251641086 is about 15863.1991098895. The cubic root of 251641086 is about 631.3359456092.

The spelling of 251641086 in words is "two hundred fifty-one million, six hundred forty-one thousand, eighty-six".