251965494 has 48 divisors (see below), whose sum is σ = 598263120. Its totient is φ = 76006080.

The previous prime is 251965487. The next prime is 251965547. The reversal of 251965494 is 494569152.

It is a super-2 number, since 2×251965494² = 126973220333328072, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42564 + ... + 48120.

It is an arithmetic number, because the mean of its divisors is an integer number (12463815).

Almost surely, 2^251965494 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 251965494, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (299131560).

251965494 is an abundant number, since it is smaller than the sum of its proper divisors (346297626).

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

251965494 is a wasteful number, since it uses less digits than its factorization.

251965494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5805 (or 5802 counting only the distinct ones).

The product of its digits is 388800, while the sum is 45.

The square root of 251965494 is about 15873.4209923381. The cubic root of 251965494 is about 631.6071287798.

The spelling of 251965494 in words is "two hundred fifty-one million, nine hundred sixty-five thousand, four hundred ninety-four".