251451066 has 16 divisors (see below), whose sum is σ = 504173664. Its totient is φ = 83605104.

The previous prime is 251451061. The next prime is 251451071. The reversal of 251451066 is 660154152.

It is an interprime number because it is at equal distance from previous prime (251451061) and next prime (251451071).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (251451061) 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, 50400 + ... + 55163.

It is an arithmetic number, because the mean of its divisors is an integer number (31510854).

Almost surely, 2^251451066 is an apocalyptic number.

251451066 is an abundant number, since it is smaller than the sum of its proper divisors (252722598).

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

251451066 is a wasteful number, since it uses less digits than its factorization.

251451066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105965.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 251451066 is about 15857.2086446512. The cubic root of 251451066 is about 631.1769934717.

The spelling of 251451066 in words is "two hundred fifty-one million, four hundred fifty-one thousand, sixty-six".