161499979 has 2 divisors, whose sum is σ = 161499980. Its totient is φ = 161499978.

The previous prime is 161499941. The next prime is 161499991. The reversal of 161499979 is 979994161.

It is a strong prime.

It is an emirp because it is prime and its reverse (979994161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161499979 - 2¹³ = 161491787 is a prime.

It is not a weakly prime, because it can be changed into another prime (161499179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80749989 + 80749990.

It is an arithmetic number, because the mean of its divisors is an integer number (80749990).

Almost surely, 2^161499979 is an apocalyptic number.

161499979 is a deficient number, since it is larger than the sum of its proper divisors (1).

161499979 is an equidigital number, since it uses as much as digits as its factorization.

161499979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1102248, while the sum is 55.

The square root of 161499979 is about 12708.2642009049. The cubic root of 161499979 is about 544.5747365697.

The spelling of 161499979 in words is "one hundred sixty-one million, four hundred ninety-nine thousand, nine hundred seventy-nine".