115661001 has 8 divisors (see below), whose sum is σ = 158382784. Its totient is φ = 75023280.

The previous prime is 115660939. The next prime is 115661003. The reversal of 115661001 is 100166511.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 115661001 - 2⁷ = 115660873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (115661003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 520885 + ... + 521106.

It is an arithmetic number, because the mean of its divisors is an integer number (19797848).

Almost surely, 2^115661001 is an apocalyptic number.

It is an amenable number.

115661001 is a deficient number, since it is larger than the sum of its proper divisors (42721783).

115661001 is a wasteful number, since it uses less digits than its factorization.

115661001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1042031.

The product of its (nonzero) digits is 180, while the sum is 21.

The square root of 115661001 is about 10754.5804660154. The cubic root of 115661001 is about 487.2243469907.

The spelling of 115661001 in words is "one hundred fifteen million, six hundred sixty-one thousand, one".