81098291 has 2 divisors, whose sum is σ = 81098292. Its totient is φ = 81098290.

The previous prime is 81098261. The next prime is 81098293. The reversal of 81098291 is 19289018.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81098291 - 2²⁶ = 13989427 is a prime.

Together with 81098293, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81098293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40549145 + 40549146.

It is an arithmetic number, because the mean of its divisors is an integer number (40549146).

Almost surely, 2^81098291 is an apocalyptic number.

81098291 is a deficient number, since it is larger than the sum of its proper divisors (1).

81098291 is an equidigital number, since it uses as much as digits as its factorization.

81098291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 38.

The square root of 81098291 is about 9005.4589555447. The cubic root of 81098291 is about 432.8498128831.

The spelling of 81098291 in words is "eighty-one million, ninety-eight thousand, two hundred ninety-one".