83913881 has 4 divisors (see below), whose sum is σ = 83997732. Its totient is φ = 83830032.

The previous prime is 83913877. The next prime is 83913889. The reversal of 83913881 is 18831938.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18831938 = 2 ⋅9415969.

It can be written as a sum of positive squares in 2 ways, for example, as 99856 + 83814025 = 316^2 + 9155^2 .

It is a cyclic number.

It is not a de Polignac number, because 83913881 - 2² = 83913877 is a prime.

It is a super-2 number, since 2×83913881² = 14083078848964322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (83913889) 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, 40406 + ... + 42431.

It is an arithmetic number, because the mean of its divisors is an integer number (20999433).

Almost surely, 2^83913881 is an apocalyptic number.

It is an amenable number.

83913881 is a deficient number, since it is larger than the sum of its proper divisors (83851).

83913881 is a wasteful number, since it uses less digits than its factorization.

83913881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83850.

The product of its digits is 41472, while the sum is 41.

The square root of 83913881 is about 9160.4520084983. The cubic root of 83913881 is about 437.8021962215.

The spelling of 83913881 in words is "eighty-three million, nine hundred thirteen thousand, eight hundred eighty-one".