83506981 has 2 divisors, whose sum is σ = 83506982. Its totient is φ = 83506980.

The previous prime is 83506961. The next prime is 83507003. The reversal of 83506981 is 18960538.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81450625 + 2056356 = 9025^2 + 1434^2 .

It is a cyclic number.

It is not a de Polignac number, because 83506981 - 2⁵ = 83506949 is a prime.

It is a super-2 number, since 2×83506981² = 13946831751468722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83506961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41753490 + 41753491.

It is an arithmetic number, because the mean of its divisors is an integer number (41753491).

Almost surely, 2^83506981 is an apocalyptic number.

It is an amenable number.

83506981 is a deficient number, since it is larger than the sum of its proper divisors (1).

83506981 is an equidigital number, since it uses as much as digits as its factorization.

83506981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 83506981 is about 9138.2154165898. The cubic root of 83506981 is about 437.0934122983.

The spelling of 83506981 in words is "eighty-three million, five hundred six thousand, nine hundred eighty-one".