79001891 has 2 divisors, whose sum is σ = 79001892. Its totient is φ = 79001890.

The previous prime is 79001863. The next prime is 79001921. The reversal of 79001891 is 19810097.

It is a weak prime.

It is an emirp because it is prime and its reverse (19810097) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79001891 - 2⁶ = 79001827 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (79001851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39500945 + 39500946.

It is an arithmetic number, because the mean of its divisors is an integer number (39500946).

Almost surely, 2^79001891 is an apocalyptic number.

79001891 is a deficient number, since it is larger than the sum of its proper divisors (1).

79001891 is an equidigital number, since it uses as much as digits as its factorization.

79001891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 35.

The square root of 79001891 is about 8888.3007937400. The cubic root of 79001891 is about 429.0874662952.

The spelling of 79001891 in words is "seventy-nine million, one thousand, eight hundred ninety-one".