1250128889 has 4 divisors (see below), whose sum is σ = 1276727424. Its totient is φ = 1223530356.

The previous prime is 1250128853. The next prime is 1250128903. The reversal of 1250128889 is 9888210521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1250128889 is a prime.

It is a super-2 number, since 2×1250128889² = 3125644478224748642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1250128189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13299197 + ... + 13299290.

It is an arithmetic number, because the mean of its divisors is an integer number (319181856).

Almost surely, 2^1250128889 is an apocalyptic number.

It is an amenable number.

1250128889 is a deficient number, since it is larger than the sum of its proper divisors (26598535).

1250128889 is an equidigital number, since it uses as much as digits as its factorization.

1250128889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26598534.

The product of its (nonzero) digits is 92160, while the sum is 44.

The square root of 1250128889 is about 35357.1617780613. The cubic root of 1250128889 is about 1077.2543681345.

The spelling of 1250128889 in words is "one billion, two hundred fifty million, one hundred twenty-eight thousand, eight hundred eighty-nine".