71979491 has 2 divisors, whose sum is σ = 71979492. Its totient is φ = 71979490.

The previous prime is 71979473. The next prime is 71979539. The reversal of 71979491 is 19497917.

It is a weak prime.

It is an emirp because it is prime and its reverse (19497917) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71979491 - 2¹⁴ = 71963107 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71979431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35989745 + 35989746.

It is an arithmetic number, because the mean of its divisors is an integer number (35989746).

Almost surely, 2^71979491 is an apocalyptic number.

71979491 is a deficient number, since it is larger than the sum of its proper divisors (1).

71979491 is an equidigital number, since it uses as much as digits as its factorization.

71979491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 142884, while the sum is 47.

The square root of 71979491 is about 8484.0727837519. The cubic root of 71979491 is about 415.9772604527.

The spelling of 71979491 in words is "seventy-one million, nine hundred seventy-nine thousand, four hundred ninety-one".