1056857189 has 2 divisors, whose sum is σ = 1056857190. Its totient is φ = 1056857188.

The previous prime is 1056857183. The next prime is 1056857209. The reversal of 1056857189 is 9817586501.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1049112100 + 7745089 = 32390^2 + 2783^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1056857189 is a prime.

It is a super-2 number, since 2×1056857189² = 2233894235881963442, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1056857183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 528428594 + 528428595.

It is an arithmetic number, because the mean of its divisors is an integer number (528428595).

Almost surely, 2^1056857189 is an apocalyptic number.

It is an amenable number.

1056857189 is a deficient number, since it is larger than the sum of its proper divisors (1).

1056857189 is an equidigital number, since it uses as much as digits as its factorization.

1056857189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 604800, while the sum is 50.

The square root of 1056857189 is about 32509.3400271368. The cubic root of 1056857189 is about 1018.6041360711.

The spelling of 1056857189 in words is "one billion, fifty-six million, eight hundred fifty-seven thousand, one hundred eighty-nine".