83913891 has 16 divisors (see below), whose sum is σ = 115533984. Its totient is φ = 54134784.

The previous prime is 83913889. The next prime is 83913919. The reversal of 83913891 is 19831938.

It is a happy number.

It is not a de Polignac number, because 83913891 - 2¹ = 83913889 is a prime.

It is a super-2 number, since 2×83913891² = 14083082205519762, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (83913191) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19465 + ... + 23381.

It is an arithmetic number, because the mean of its divisors is an integer number (7220874).

Almost surely, 2^83913891 is an apocalyptic number.

83913891 is a deficient number, since it is larger than the sum of its proper divisors (31620093).

83913891 is a wasteful number, since it uses less digits than its factorization.

83913891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4150.

The product of its digits is 46656, while the sum is 42.

The square root of 83913891 is about 9160.4525543228. The cubic root of 83913891 is about 437.8022136124.

The spelling of 83913891 in words is "eighty-three million, nine hundred thirteen thousand, eight hundred ninety-one".