80722391 has 2 divisors, whose sum is σ = 80722392. Its totient is φ = 80722390.

The previous prime is 80722381. The next prime is 80722403. The reversal of 80722391 is 19322708.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80722391 is a prime.

It is a super-2 number, since 2×80722391² = 13032208817513762, which contains 22 as substring.

It is a Sophie Germain prime.

It is equal to p_4709066 and since 80722391 and 4709066 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80722321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40361195 + 40361196.

It is an arithmetic number, because the mean of its divisors is an integer number (40361196).

Almost surely, 2^80722391 is an apocalyptic number.

80722391 is a deficient number, since it is larger than the sum of its proper divisors (1).

80722391 is an equidigital number, since it uses as much as digits as its factorization.

80722391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 80722391 is about 8984.5640406199. The cubic root of 80722391 is about 432.1800072166.

The spelling of 80722391 in words is "eighty million, seven hundred twenty-two thousand, three hundred ninety-one".