83981911 has 4 divisors (see below), whose sum is σ = 90442072. Its totient is φ = 77521752.

The previous prime is 83981893. The next prime is 83981917. The reversal of 83981911 is 11918938.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 83981911 - 2⁷ = 83981783 is a prime.

It is a super-2 number, since 2×83981911² = 14105922750423842, 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 (83981917) 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 3 ways as a sum of consecutive naturals, for example, 3230061 + ... + 3230086.

It is an arithmetic number, because the mean of its divisors is an integer number (22610518).

Almost surely, 2^83981911 is an apocalyptic number.

83981911 is a deficient number, since it is larger than the sum of its proper divisors (6460161).

83981911 is a wasteful number, since it uses less digits than its factorization.

83981911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6460160.

The product of its digits is 15552, while the sum is 40.

The square root of 83981911 is about 9164.1645009242. The cubic root of 83981911 is about 437.9204747789.

The spelling of 83981911 in words is "eighty-three million, nine hundred eighty-one thousand, nine hundred eleven".