82991413 has 2 divisors, whose sum is σ = 82991414. Its totient is φ = 82991412.

The previous prime is 82991369. The next prime is 82991431. The reversal of 82991413 is 31419928.

Together with next prime (82991431) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80245764 + 2745649 = 8958^2 + 1657^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82991413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82991443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41495706 + 41495707.

It is an arithmetic number, because the mean of its divisors is an integer number (41495707).

Almost surely, 2^82991413 is an apocalyptic number.

It is an amenable number.

82991413 is a deficient number, since it is larger than the sum of its proper divisors (1).

82991413 is an equidigital number, since it uses as much as digits as its factorization.

82991413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 37.

The square root of 82991413 is about 9109.9622941042. The cubic root of 82991413 is about 436.1920236143.

The spelling of 82991413 in words is "eighty-two million, nine hundred ninety-one thousand, four hundred thirteen".