81733969 has 2 divisors, whose sum is σ = 81733970. Its totient is φ = 81733968.

The previous prime is 81733933. The next prime is 81734017. The reversal of 81733969 is 96933718.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48233025 + 33500944 = 6945^2 + 5788^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81733969 is a prime.

It is a super-2 number, since 2×81733969² = 13360883376985922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (81739969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40866984 + 40866985.

It is an arithmetic number, because the mean of its divisors is an integer number (40866985).

Almost surely, 2^81733969 is an apocalyptic number.

It is an amenable number.

81733969 is a deficient number, since it is larger than the sum of its proper divisors (1).

81733969 is an equidigital number, since it uses as much as digits as its factorization.

81733969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 46.

The square root of 81733969 is about 9040.6841002216. The cubic root of 81733969 is about 433.9778156952.

The spelling of 81733969 in words is "eighty-one million, seven hundred thirty-three thousand, nine hundred sixty-nine".