251871957212 has 6 divisors (see below), whose sum is σ = 440775925128. Its totient is φ = 125935978604.

The previous prime is 251871957193. The next prime is 251871957221. The reversal of 251871957212 is 212759178152.

251871957212 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

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, 31483994648 + ... + 31483994655.

It is an arithmetic number, because the mean of its divisors is an integer number (73462654188).

Almost surely, 2^251871957212 is an apocalyptic number.

It is an amenable number.

251871957212 is a deficient number, since it is larger than the sum of its proper divisors (188903967916).

251871957212 is a wasteful number, since it uses less digits than its factorization.

251871957212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62967989307 (or 62967989305 counting only the distinct ones).

The product of its digits is 705600, while the sum is 50.

The spelling of 251871957212 in words is "two hundred fifty-one billion, eight hundred seventy-one million, nine hundred fifty-seven thousand, two hundred twelve".