161922511 has 2 divisors, whose sum is σ = 161922512. Its totient is φ = 161922510.

The previous prime is 161922479. The next prime is 161922533. The reversal of 161922511 is 115229161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161922511 - 2⁵ = 161922479 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161922511.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161922581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80961255 + 80961256.

It is an arithmetic number, because the mean of its divisors is an integer number (80961256).

Almost surely, 2^161922511 is an apocalyptic number.

161922511 is a deficient number, since it is larger than the sum of its proper divisors (1).

161922511 is an equidigital number, since it uses as much as digits as its factorization.

161922511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080, while the sum is 28.

The square root of 161922511 is about 12724.8776418479. The cubic root of 161922511 is about 545.0492461742.

The spelling of 161922511 in words is "one hundred sixty-one million, nine hundred twenty-two thousand, five hundred eleven".