79491571 has 2 divisors, whose sum is σ = 79491572. Its totient is φ = 79491570.

The previous prime is 79491569. The next prime is 79491583. The reversal of 79491571 is 17519497.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 79491571 - 2¹ = 79491569 is a prime.

Together with 79491569, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (79491271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39745785 + 39745786.

It is an arithmetic number, because the mean of its divisors is an integer number (39745786).

Almost surely, 2^79491571 is an apocalyptic number.

79491571 is a deficient number, since it is larger than the sum of its proper divisors (1).

79491571 is an equidigital number, since it uses as much as digits as its factorization.

79491571 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 79380, while the sum is 43.

The square root of 79491571 is about 8915.8045626853. The cubic root of 79491571 is about 429.9721831654.

The spelling of 79491571 in words is "seventy-nine million, four hundred ninety-one thousand, five hundred seventy-one".