9994621979 has 2 divisors, whose sum is σ = 9994621980. Its totient is φ = 9994621978.

The previous prime is 9994621943. The next prime is 9994621981. The reversal of 9994621979 is 9791264999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9994621979 - 2³² = 5699654683 is a prime.

Together with 9994621981, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (9994621919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4997310989 + 4997310990.

It is an arithmetic number, because the mean of its divisors is an integer number (4997310990).

Almost surely, 2^9994621979 is an apocalyptic number.

9994621979 is a deficient number, since it is larger than the sum of its proper divisors (1).

9994621979 is an equidigital number, since it uses as much as digits as its factorization.

9994621979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19840464, while the sum is 65.

The square root of 9994621979 is about 99973.1062786388. The cubic root of 9994621979 is about 2154.0484009410.

The spelling of 9994621979 in words is "nine billion, nine hundred ninety-four million, six hundred twenty-one thousand, nine hundred seventy-nine".