81772307 has 2 divisors, whose sum is σ = 81772308. Its totient is φ = 81772306.

The previous prime is 81772297. The next prime is 81772309. The reversal of 81772307 is 70327718.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81772307 is a prime.

Together with 81772309, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81772309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40886153 + 40886154.

It is an arithmetic number, because the mean of its divisors is an integer number (40886154).

Almost surely, 2^81772307 is an apocalyptic number.

81772307 is a deficient number, since it is larger than the sum of its proper divisors (1).

81772307 is an equidigital number, since it uses as much as digits as its factorization.

81772307 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16464, while the sum is 35.

The square root of 81772307 is about 9042.8041557915. The cubic root of 81772307 is about 434.0456587271.

The spelling of 81772307 in words is "eighty-one million, seven hundred seventy-two thousand, three hundred seven".