161922649 has 16 divisors (see below), whose sum is σ = 190067328. Its totient is φ = 135055872.

The previous prime is 161922643. The next prime is 161922659. The reversal of 161922649 is 946229161.

It is not a de Polignac number, because 161922649 - 2¹⁹ = 161398361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161922643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94569 + ... + 96265.

It is an arithmetic number, because the mean of its divisors is an integer number (11879208).

Almost surely, 2^161922649 is an apocalyptic number.

It is an amenable number.

161922649 is a deficient number, since it is larger than the sum of its proper divisors (28144679).

161922649 is a wasteful number, since it uses less digits than its factorization.

161922649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2064.

The product of its digits is 46656, while the sum is 40.

The square root of 161922649 is about 12724.8830642957. The cubic root of 161922649 is about 545.0494010153.

The spelling of 161922649 in words is "one hundred sixty-one million, nine hundred twenty-two thousand, six hundred forty-nine".