116909981 has 4 divisors (see below), whose sum is σ = 117751200. Its totient is φ = 116068764.

The previous prime is 116909971. The next prime is 116909987. The reversal of 116909981 is 189909611.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 189909611 = 1663 ⋅114197.

It is a cyclic number.

It is not a de Polignac number, because 116909981 - 2²² = 112715677 is a prime.

It is a super-2 number, since 2×116909981² = 27335887314840722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (116909987) 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, 420401 + ... + 420678.

It is an arithmetic number, because the mean of its divisors is an integer number (29437800).

Almost surely, 2^116909981 is an apocalyptic number.

It is an amenable number.

116909981 is a deficient number, since it is larger than the sum of its proper divisors (841219).

116909981 is an equidigital number, since it uses as much as digits as its factorization.

116909981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 841218.

The product of its (nonzero) digits is 34992, while the sum is 44.

The square root of 116909981 is about 10812.4918959507. The cubic root of 116909981 is about 488.9718564215.

The spelling of 116909981 in words is "one hundred sixteen million, nine hundred nine thousand, nine hundred eighty-one".