115631645 has 4 divisors (see below), whose sum is σ = 138757980. Its totient is φ = 92505312.

The previous prime is 115631629. The next prime is 115631647. The reversal of 115631645 is 546136511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 546136511 = 131 ⋅4168981.

It can be written as a sum of positive squares in 2 ways, for example, as 46758244 + 68873401 = 6838^2 + 8299^2 .

It is a cyclic number.

It is not a de Polignac number, because 115631645 - 2⁴ = 115631629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115631647) 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, 11563160 + ... + 11563169.

It is an arithmetic number, because the mean of its divisors is an integer number (34689495).

Almost surely, 2^115631645 is an apocalyptic number.

It is an amenable number.

115631645 is a deficient number, since it is larger than the sum of its proper divisors (23126335).

115631645 is an equidigital number, since it uses as much as digits as its factorization.

115631645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23126334.

The product of its digits is 10800, while the sum is 32.

The square root of 115631645 is about 10753.2155655878. The cubic root of 115631645 is about 487.1831225847.

The spelling of 115631645 in words is "one hundred fifteen million, six hundred thirty-one thousand, six hundred forty-five".