81080959 has 2 divisors, whose sum is σ = 81080960. Its totient is φ = 81080958.

The previous prime is 81080917. The next prime is 81080977. The reversal of 81080959 is 95908018.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81080959 - 2¹³ = 81072767 is a prime.

It is equal to p_4728955 and since 81080959 and 4728955 have the same sum of digits, it is a Honaker prime.

It is a nialpdrome in base 14.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81086959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40540479 + 40540480.

It is an arithmetic number, because the mean of its divisors is an integer number (40540480).

Almost surely, 2^81080959 is an apocalyptic number.

81080959 is a deficient number, since it is larger than the sum of its proper divisors (1).

81080959 is an equidigital number, since it uses as much as digits as its factorization.

81080959 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 40.

The square root of 81080959 is about 9004.4965989221. The cubic root of 81080959 is about 432.8189750468.

The spelling of 81080959 in words is "eighty-one million, eighty thousand, nine hundred fifty-nine".