81953411 has 2 divisors, whose sum is σ = 81953412. Its totient is φ = 81953410.

The previous prime is 81953351. The next prime is 81953437. The reversal of 81953411 is 11435918.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81953411 - 2²⁶ = 14844547 is a prime.

It is not a weakly prime, because it can be changed into another prime (81953461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40976705 + 40976706.

It is an arithmetic number, because the mean of its divisors is an integer number (40976706).

Almost surely, 2^81953411 is an apocalyptic number.

81953411 is a deficient number, since it is larger than the sum of its proper divisors (1).

81953411 is an equidigital number, since it uses as much as digits as its factorization.

81953411 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 32.

The square root of 81953411 is about 9052.8123254600. The cubic root of 81953411 is about 434.3658545148.

The spelling of 81953411 in words is "eighty-one million, nine hundred fifty-three thousand, four hundred eleven".