251099494 has 4 divisors (see below), whose sum is σ = 376649244. Its totient is φ = 125549746.

The previous prime is 251099467. The next prime is 251099507. The reversal of 251099494 is 494990152.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 251099494.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 62774872 + ... + 62774875.

It is an arithmetic number, because the mean of its divisors is an integer number (94162311).

Almost surely, 2^251099494 is an apocalyptic number.

251099494 is a deficient number, since it is larger than the sum of its proper divisors (125549750).

251099494 is a wasteful number, since it uses less digits than its factorization.

251099494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125549749.

The product of its (nonzero) digits is 116640, while the sum is 43.

The square root of 251099494 is about 15846.1192094468. The cubic root of 251099494 is about 630.8826914669.

The spelling of 251099494 in words is "two hundred fifty-one million, ninety-nine thousand, four hundred ninety-four".