115981501 has 2 divisors, whose sum is σ = 115981502. Its totient is φ = 115981500.

The previous prime is 115981499. The next prime is 115981513. The reversal of 115981501 is 105189511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 114468601 + 1512900 = 10699^2 + 1230^2 .

It is a cyclic number.

It is not a de Polignac number, because 115981501 - 2¹ = 115981499 is a prime.

Together with 115981499, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (115981001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57990750 + 57990751.

It is an arithmetic number, because the mean of its divisors is an integer number (57990751).

Almost surely, 2^115981501 is an apocalyptic number.

It is an amenable number.

115981501 is a deficient number, since it is larger than the sum of its proper divisors (1).

115981501 is an equidigital number, since it uses as much as digits as its factorization.

115981501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 31.

The square root of 115981501 is about 10769.4707855122. The cubic root of 115981501 is about 487.6739695556.

The spelling of 115981501 in words is "one hundred fifteen million, nine hundred eighty-one thousand, five hundred one".