116815691 has 4 divisors (see below), whose sum is σ = 117972384. Its totient is φ = 115659000.

The previous prime is 116815637. The next prime is 116815703. The reversal of 116815691 is 196518611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 196518611 = 1049 ⋅187339.

It is a cyclic number.

It is not a de Polignac number, because 116815691 - 2¹⁴ = 116799307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (116815631) 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, 578195 + ... + 578396.

It is an arithmetic number, because the mean of its divisors is an integer number (29493096).

Almost surely, 2^116815691 is an apocalyptic number.

116815691 is a deficient number, since it is larger than the sum of its proper divisors (1156693).

116815691 is a wasteful number, since it uses less digits than its factorization.

116815691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1156692.

The product of its digits is 12960, while the sum is 38.

The square root of 116815691 is about 10808.1307819623. The cubic root of 116815691 is about 488.8403662031.

The spelling of 116815691 in words is "one hundred sixteen million, eight hundred fifteen thousand, six hundred ninety-one".