116542991 has 4 divisors (see below), whose sum is σ = 117696984. Its totient is φ = 115389000.

The previous prime is 116542969. The next prime is 116543003. The reversal of 116542991 is 199245611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 199245611 = 4987 ⋅39953.

It is a cyclic number.

It is not a de Polignac number, because 116542991 - 2²⁶ = 49434127 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (116542931) 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, 576845 + ... + 577046.

It is an arithmetic number, because the mean of its divisors is an integer number (29424246).

Almost surely, 2^116542991 is an apocalyptic number.

116542991 is a deficient number, since it is larger than the sum of its proper divisors (1153993).

116542991 is a wasteful number, since it uses less digits than its factorization.

116542991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1153992.

The product of its digits is 19440, while the sum is 38.

The square root of 116542991 is about 10795.5079083849. The cubic root of 116542991 is about 488.4596792310.

The spelling of 116542991 in words is "one hundred sixteen million, five hundred forty-two thousand, nine hundred ninety-one".