80042791 has 2 divisors, whose sum is σ = 80042792. Its totient is φ = 80042790.

The previous prime is 80042779. The next prime is 80042843. The reversal of 80042791 is 19724008.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 80042791 - 2⁷ = 80042663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80042731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40021395 + 40021396.

It is an arithmetic number, because the mean of its divisors is an integer number (40021396).

Almost surely, 2^80042791 is an apocalyptic number.

80042791 is a deficient number, since it is larger than the sum of its proper divisors (1).

80042791 is an equidigital number, since it uses as much as digits as its factorization.

80042791 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 80042791 is about 8946.6636798306. The cubic root of 80042791 is about 430.9637496585.

Adding to 80042791 its reverse (19724008), we get a palindrome (99766799).

The spelling of 80042791 in words is "eighty million, forty-two thousand, seven hundred ninety-one".