161933879 has 2 divisors, whose sum is σ = 161933880. Its totient is φ = 161933878.

The previous prime is 161933873. The next prime is 161933897. The reversal of 161933879 is 978339161.

It is a happy number.

Together with next prime (161933897) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161933879 - 2⁸ = 161933623 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161933873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80966939 + 80966940.

It is an arithmetic number, because the mean of its divisors is an integer number (80966940).

Almost surely, 2^161933879 is an apocalyptic number.

161933879 is a deficient number, since it is larger than the sum of its proper divisors (1).

161933879 is an equidigital number, since it uses as much as digits as its factorization.

161933879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 47.

The square root of 161933879 is about 12725.3243180675. The cubic root of 161933879 is about 545.0620011947.

The spelling of 161933879 in words is "one hundred sixty-one million, nine hundred thirty-three thousand, eight hundred seventy-nine".