1145989157 has 2 divisors, whose sum is σ = 1145989158. Its totient is φ = 1145989156.

The previous prime is 1145989147. The next prime is 1145989181. The reversal of 1145989157 is 7519895411.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 972566596 + 173422561 = 31186^2 + 13169^2 .

It is a cyclic number.

It is not a de Polignac number, because 1145989157 - 2³⁰ = 72247333 is a prime.

It is a super-2 number, since 2×1145989157² = 2626582295923141298, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1145989147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 572994578 + 572994579.

It is an arithmetic number, because the mean of its divisors is an integer number (572994579).

Almost surely, 2^1145989157 is an apocalyptic number.

It is an amenable number.

1145989157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1145989157 is an equidigital number, since it uses as much as digits as its factorization.

1145989157 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 1145989157 is about 33852.4616091651. The cubic root of 1145989157 is about 1046.4701291061.

The spelling of 1145989157 in words is "one billion, one hundred forty-five million, nine hundred eighty-nine thousand, one hundred fifty-seven".