1251895222 has 8 divisors (see below), whose sum is σ = 1928595456. Its totient is φ = 609030072.

The previous prime is 1251895219. The next prime is 1251895223. The reversal of 1251895222 is 2225981521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251895223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8458678 + ... + 8458825.

It is an arithmetic number, because the mean of its divisors is an integer number (241074432).

Almost surely, 2^1251895222 is an apocalyptic number.

1251895222 is a deficient number, since it is larger than the sum of its proper divisors (676700234).

1251895222 is a wasteful number, since it uses less digits than its factorization.

1251895222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16917542.

The product of its digits is 28800, while the sum is 37.

The square root of 1251895222 is about 35382.1313942504. The cubic root of 1251895222 is about 1077.7614877058.

The spelling of 1251895222 in words is "one billion, two hundred fifty-one million, eight hundred ninety-five thousand, two hundred twenty-two".