83691613 has 2 divisors, whose sum is σ = 83691614. Its totient is φ = 83691612.

The previous prime is 83691589. The next prime is 83691659. The reversal of 83691613 is 31619638.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51451929 + 32239684 = 7173^2 + 5678^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-83691613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83692613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41845806 + 41845807.

It is an arithmetic number, because the mean of its divisors is an integer number (41845807).

Almost surely, 2^83691613 is an apocalyptic number.

It is an amenable number.

83691613 is a deficient number, since it is larger than the sum of its proper divisors (1).

83691613 is an equidigital number, since it uses as much as digits as its factorization.

83691613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 37.

The square root of 83691613 is about 9148.3120300960. The cubic root of 83691613 is about 437.4153096477.

The spelling of 83691613 in words is "eighty-three million, six hundred ninety-one thousand, six hundred thirteen".