83989531 has 2 divisors, whose sum is σ = 83989532. Its totient is φ = 83989530.

The previous prime is 83989523. The next prime is 83989541. The reversal of 83989531 is 13598938.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 83989531 - 2³ = 83989523 is a prime.

It is a super-2 number, since 2×83989531² = 14108482635199922, which contains 22 as substring.

It is equal to p_4888558 and since 83989531 and 4888558 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (83989501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41994765 + 41994766.

It is an arithmetic number, because the mean of its divisors is an integer number (41994766).

Almost surely, 2^83989531 is an apocalyptic number.

83989531 is a deficient number, since it is larger than the sum of its proper divisors (1).

83989531 is an equidigital number, since it uses as much as digits as its factorization.

83989531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 233280, while the sum is 46.

The square root of 83989531 is about 9164.5802413422. The cubic root of 83989531 is about 437.9337191115.

The spelling of 83989531 in words is "eighty-three million, nine hundred eighty-nine thousand, five hundred thirty-one".