115640149 has 4 divisors (see below), whose sum is σ = 115661664. Its totient is φ = 115618636.

The previous prime is 115640123. The next prime is 115640153. The reversal of 115640149 is 941046511.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 115640149 - 2¹¹ = 115638101 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 115640149.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115650149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4974 + ... + 16000.

It is an arithmetic number, because the mean of its divisors is an integer number (28915416).

Almost surely, 2^115640149 is an apocalyptic number.

It is an amenable number.

115640149 is a deficient number, since it is larger than the sum of its proper divisors (21515).

115640149 is a wasteful number, since it uses less digits than its factorization.

115640149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21514.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 115640149 is about 10753.6109749237. The cubic root of 115640149 is about 487.1950654045.

The spelling of 115640149 in words is "one hundred fifteen million, six hundred forty thousand, one hundred forty-nine".