83669591 has 2 divisors, whose sum is σ = 83669592. Its totient is φ = 83669590.

The previous prime is 83669587. The next prime is 83669623. The reversal of 83669591 is 19596638.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 83669591 - 2² = 83669587 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83665591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41834795 + 41834796.

It is an arithmetic number, because the mean of its divisors is an integer number (41834796).

Almost surely, 2^83669591 is an apocalyptic number.

83669591 is a deficient number, since it is larger than the sum of its proper divisors (1).

83669591 is an equidigital number, since it uses as much as digits as its factorization.

83669591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 349920, while the sum is 47.

The square root of 83669591 is about 9147.1083408911. The cubic root of 83669591 is about 437.3769401918.

The spelling of 83669591 in words is "eighty-three million, six hundred sixty-nine thousand, five hundred ninety-one".