1022251887 has 16 divisors (see below), whose sum is σ = 1515646560. Its totient is φ = 680961600.

The previous prime is 1022251861. The next prime is 1022251907. The reversal of 1022251887 is 7881522201.

It is a de Polignac number, because none of the positive numbers 2^k-1022251887 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1022251817) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21337 + ... + 49997.

It is an arithmetic number, because the mean of its divisors is an integer number (94727910).

Almost surely, 2^1022251887 is an apocalyptic number.

1022251887 is a deficient number, since it is larger than the sum of its proper divisors (493394673).

1022251887 is a wasteful number, since it uses less digits than its factorization.

1022251887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29991 (or 29985 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 36.

The square root of 1022251887 is about 31972.6740670842. The cubic root of 1022251887 is about 1007.3629495842.

The spelling of 1022251887 in words is "one billion, twenty-two million, two hundred fifty-one thousand, eight hundred eighty-seven".