115751989 has 2 divisors, whose sum is σ = 115751990. Its totient is φ = 115751988.

The previous prime is 115751983. The next prime is 115752017. The reversal of 115751989 is 989157511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 103184964 + 12567025 = 10158^2 + 3545^2 .

It is an emirp because it is prime and its reverse (989157511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 115751989 - 2³ = 115751981 is a prime.

It is a super-2 number, since 2×115751989² = 26797045914912242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (115751981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57875994 + 57875995.

It is an arithmetic number, because the mean of its divisors is an integer number (57875995).

Almost surely, 2^115751989 is an apocalyptic number.

It is an amenable number.

115751989 is a deficient number, since it is larger than the sum of its proper divisors (1).

115751989 is an equidigital number, since it uses as much as digits as its factorization.

115751989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 113400, while the sum is 46.

The square root of 115751989 is about 10758.8098319470. The cubic root of 115751989 is about 487.3520764434.

The spelling of 115751989 in words is "one hundred fifteen million, seven hundred fifty-one thousand, nine hundred eighty-nine".