79781671 has 2 divisors, whose sum is σ = 79781672. Its totient is φ = 79781670.

The previous prime is 79781659. The next prime is 79781683. The reversal of 79781671 is 17618797.

It is a balanced prime because it is at equal distance from previous prime (79781659) and next prime (79781683).

It is a cyclic number.

It is not a de Polignac number, because 79781671 - 2⁷ = 79781543 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79781621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39890835 + 39890836.

It is an arithmetic number, because the mean of its divisors is an integer number (39890836).

Almost surely, 2^79781671 is an apocalyptic number.

79781671 is a deficient number, since it is larger than the sum of its proper divisors (1).

79781671 is an equidigital number, since it uses as much as digits as its factorization.

79781671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 148176, while the sum is 46.

The square root of 79781671 is about 8932.0586093017. The cubic root of 79781671 is about 430.4946012364.

The spelling of 79781671 in words is "seventy-nine million, seven hundred eighty-one thousand, six hundred seventy-one".