81308707 has 2 divisors, whose sum is σ = 81308708. Its totient is φ = 81308706.

The previous prime is 81308683. The next prime is 81308713. The reversal of 81308707 is 70780318.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81308707 is a prime.

It is a super-2 number, since 2×81308707² = 13222211668023698, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (81300707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40654353 + 40654354.

It is an arithmetic number, because the mean of its divisors is an integer number (40654354).

Almost surely, 2^81308707 is an apocalyptic number.

81308707 is a deficient number, since it is larger than the sum of its proper divisors (1).

81308707 is an equidigital number, since it uses as much as digits as its factorization.

81308707 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9408, while the sum is 34.

The square root of 81308707 is about 9017.1340790741. The cubic root of 81308707 is about 433.2238440671.

The spelling of 81308707 in words is "eighty-one million, three hundred eight thousand, seven hundred seven".