81932293 has 2 divisors, whose sum is σ = 81932294. Its totient is φ = 81932292.

The previous prime is 81932273. The next prime is 81932303. The reversal of 81932293 is 39223918.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50381604 + 31550689 = 7098^2 + 5617^2 .

It is a cyclic number.

It is not a de Polignac number, because 81932293 - 2⁵ = 81932261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81932273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40966146 + 40966147.

It is an arithmetic number, because the mean of its divisors is an integer number (40966147).

Almost surely, 2^81932293 is an apocalyptic number.

It is an amenable number.

81932293 is a deficient number, since it is larger than the sum of its proper divisors (1).

81932293 is an equidigital number, since it uses as much as digits as its factorization.

81932293 is an odious number, because the sum of its binary digits is odd.

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

The square root of 81932293 is about 9051.6458724367. The cubic root of 81932293 is about 434.3285417456.

The spelling of 81932293 in words is "eighty-one million, nine hundred thirty-two thousand, two hundred ninety-three".