81733907 has 2 divisors, whose sum is σ = 81733908. Its totient is φ = 81733906.

The previous prime is 81733901. The next prime is 81733931. The reversal of 81733907 is 70933718.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81733907 - 2⁴ = 81733891 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81733901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40866953 + 40866954.

It is an arithmetic number, because the mean of its divisors is an integer number (40866954).

Almost surely, 2^81733907 is an apocalyptic number.

81733907 is a deficient number, since it is larger than the sum of its proper divisors (1).

81733907 is an equidigital number, since it uses as much as digits as its factorization.

81733907 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31752, while the sum is 38.

The square root of 81733907 is about 9040.6806712769. The cubic root of 81733907 is about 433.9777059626.

The spelling of 81733907 in words is "eighty-one million, seven hundred thirty-three thousand, nine hundred seven".