251161326 has 96 divisors (see below), whose sum is σ = 614210688. Its totient is φ = 73658880.

The previous prime is 251161271. The next prime is 251161327. The reversal of 251161326 is 623161152.

251161326 is a `hidden beast` number, since 25 + 1 + 1 + 613 + 26 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 251161326.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251161327) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 450640 + ... + 451196.

It is an arithmetic number, because the mean of its divisors is an integer number (6398028).

Almost surely, 2^251161326 is an apocalyptic number.

251161326 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 251161326, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (307105344).

251161326 is an abundant number, since it is smaller than the sum of its proper divisors (363049362).

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

251161326 is a wasteful number, since it uses less digits than its factorization.

251161326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666 (or 663 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 251161326 is about 15848.0701033280. The cubic root of 251161326 is about 630.9344711241.

The spelling of 251161326 in words is "two hundred fifty-one million, one hundred sixty-one thousand, three hundred twenty-six".