801236991979 has 2 divisors, whose sum is σ = 801236991980. Its totient is φ = 801236991978.

The previous prime is 801236991977. The next prime is 801236992021. The reversal of 801236991979 is 979199632108.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 801236991979 - 2¹ = 801236991977 is a prime.

It is a super-2 number, since 2×801236991979² (a number of 25 digits) contains 22 as substring.

Together with 801236991977, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 801236991979.

It is not a weakly prime, because it can be changed into another prime (801236991977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 400618495989 + 400618495990.

It is an arithmetic number, because the mean of its divisors is an integer number (400618495990).

Almost surely, 2^801236991979 is an apocalyptic number.

801236991979 is a deficient number, since it is larger than the sum of its proper divisors (1).

801236991979 is an equidigital number, since it uses as much as digits as its factorization.

801236991979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13226976, while the sum is 64.

The spelling of 801236991979 in words is "eight hundred one billion, two hundred thirty-six million, nine hundred ninety-one thousand, nine hundred seventy-nine".