1157145989 has 2 divisors, whose sum is σ = 1157145990. Its totient is φ = 1157145988.

The previous prime is 1157145973. The next prime is 1157146007. The reversal of 1157145989 is 9895417511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1021889089 + 135256900 = 31967^2 + 11630^2 .

It is a cyclic number.

It is not a de Polignac number, because 1157145989 - 2⁴ = 1157145973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1157145089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 578572994 + 578572995.

It is an arithmetic number, because the mean of its divisors is an integer number (578572995).

Almost surely, 2^1157145989 is an apocalyptic number.

It is an amenable number.

1157145989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1157145989 is an equidigital number, since it uses as much as digits as its factorization.

1157145989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 453600, while the sum is 50.

The square root of 1157145989 is about 34016.8486047723. The cubic root of 1157145989 is about 1049.8551543205.

The spelling of 1157145989 in words is "one billion, one hundred fifty-seven million, one hundred forty-five thousand, nine hundred eighty-nine".