115640161 has 8 divisors (see below), whose sum is σ = 142326464. Its totient is φ = 91495440.

The previous prime is 115640153. The next prime is 115640167. The reversal of 115640161 is 161046511.

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

It is a cyclic number.

It is not a de Polignac number, because 115640161 - 2³ = 115640153 is a prime.

It is a super-2 number, since 2×115640161² = 26745293672211842, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (115640167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 635295 + ... + 635476.

It is an arithmetic number, because the mean of its divisors is an integer number (17790808).

Almost surely, 2^115640161 is an apocalyptic number.

It is an amenable number.

115640161 is a deficient number, since it is larger than the sum of its proper divisors (26686303).

115640161 is a wasteful number, since it uses less digits than its factorization.

115640161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1270791.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 115640161 is about 10753.6115328758. The cubic root of 115640161 is about 487.1950822566.

Adding to 115640161 its reverse (161046511), we get a palindrome (276686672).

The spelling of 115640161 in words is "one hundred fifteen million, six hundred forty thousand, one hundred sixty-one".