4089691979 has 2 divisors, whose sum is σ = 4089691980. Its totient is φ = 4089691978.

The previous prime is 4089691943. The next prime is 4089691999. The reversal of 4089691979 is 9791969804.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4089691979 is a prime.

It is not a weakly prime, because it can be changed into another prime (4089691999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2044845989 + 2044845990.

It is an arithmetic number, because the mean of its divisors is an integer number (2044845990).

Almost surely, 2^4089691979 is an apocalyptic number.

4089691979 is a deficient number, since it is larger than the sum of its proper divisors (1).

4089691979 is an equidigital number, since it uses as much as digits as its factorization.

4089691979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8817984, while the sum is 62.

The square root of 4089691979 is about 63950.6995974243. The cubic root of 4089691979 is about 1599.1782210959.

The spelling of 4089691979 in words is "four billion, eighty-nine million, six hundred ninety-one thousand, nine hundred seventy-nine".