251138869190 has 32 divisors (see below), whose sum is σ = 502450058016. Its totient is φ = 89600143360.

The previous prime is 251138869153. The next prime is 251138869229. The reversal of 251138869190 is 91968831152.

It is a happy number.

251138869190 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×251138869190² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (53).

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 in 15 ways as a sum of consecutive naturals, for example, 21532667 + ... + 21544326.

It is an arithmetic number, because the mean of its divisors is an integer number (15701564313).

Almost surely, 2^251138869190 is an apocalyptic number.

251138869190 is an abundant number, since it is smaller than the sum of its proper divisors (251311188826).

251138869190 is a wasteful number, since it uses less digits than its factorization.

251138869190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43077064.

The product of its (nonzero) digits is 933120, while the sum is 53.

The spelling of 251138869190 in words is "two hundred fifty-one billion, one hundred thirty-eight million, eight hundred sixty-nine thousand, one hundred ninety".