1956657189 has 16 divisors (see below), whose sum is σ = 2649733632. Its totient is φ = 1284121968.

The previous prime is 1956657169. The next prime is 1956657193. The reversal of 1956657189 is 9817566591.

It is not a de Polignac number, because 1956657189 - 2²⁴ = 1939879973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1956657119) 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, 56584 + ... + 84350.

It is an arithmetic number, because the mean of its divisors is an integer number (165608352).

Almost surely, 2^1956657189 is an apocalyptic number.

It is an amenable number.

1956657189 is a deficient number, since it is larger than the sum of its proper divisors (693076443).

1956657189 is a wasteful number, since it uses less digits than its factorization.

1956657189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28136.

The product of its digits is 4082400, while the sum is 57.

The square root of 1956657189 is about 44234.1179294897. The cubic root of 1956657189 is about 1250.7530798588.

The spelling of 1956657189 in words is "one billion, nine hundred fifty-six million, six hundred fifty-seven thousand, one hundred eighty-nine".