82991369 has 2 divisors, whose sum is σ = 82991370. Its totient is φ = 82991368.

The previous prime is 82991353. The next prime is 82991413. The reversal of 82991369 is 96319928.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78943225 + 4048144 = 8885^2 + 2012^2 .

It is a cyclic number.

It is not a de Polignac number, because 82991369 - 2⁴ = 82991353 is a prime.

It is a super-2 number, since 2×82991369² = 13775134656988322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (82991669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41495684 + 41495685.

It is an arithmetic number, because the mean of its divisors is an integer number (41495685).

Almost surely, 2^82991369 is an apocalyptic number.

It is an amenable number.

82991369 is a deficient number, since it is larger than the sum of its proper divisors (1).

82991369 is an equidigital number, since it uses as much as digits as its factorization.

82991369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 209952, while the sum is 47.

The square root of 82991369 is about 9109.9598791652. The cubic root of 82991369 is about 436.1919465282.

The spelling of 82991369 in words is "eighty-two million, nine hundred ninety-one thousand, three hundred sixty-nine".