116660391 has 4 divisors (see below), whose sum is σ = 155547192. Its totient is φ = 77773592.

The previous prime is 116660389. The next prime is 116660407. The reversal of 116660391 is 193066611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 193066611 = 3 ⋅64355537.

It is a cyclic number.

It is not a de Polignac number, because 116660391 - 2¹ = 116660389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (116660311) 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, 19443396 + ... + 19443401.

It is an arithmetic number, because the mean of its divisors is an integer number (38886798).

Almost surely, 2^116660391 is an apocalyptic number.

116660391 is a deficient number, since it is larger than the sum of its proper divisors (38886801).

116660391 is an equidigital number, since it uses as much as digits as its factorization.

116660391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38886800.

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 116660391 is about 10800.9439865227. The cubic root of 116660391 is about 488.6236413906.

The spelling of 116660391 in words is "one hundred sixteen million, six hundred sixty thousand, three hundred ninety-one".