81733711 has 2 divisors, whose sum is σ = 81733712. Its totient is φ = 81733710.

The previous prime is 81733681. The next prime is 81733721. The reversal of 81733711 is 11733718.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81733711 - 2⁵ = 81733679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81733721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40866855 + 40866856.

It is an arithmetic number, because the mean of its divisors is an integer number (40866856).

Almost surely, 2^81733711 is an apocalyptic number.

81733711 is a deficient number, since it is larger than the sum of its proper divisors (1).

81733711 is an equidigital number, since it uses as much as digits as its factorization.

81733711 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3528, while the sum is 31.

The square root of 81733711 is about 9040.6698313786. The cubic root of 81733711 is about 433.9773590658.

The spelling of 81733711 in words is "eighty-one million, seven hundred thirty-three thousand, seven hundred eleven".