161481649 has 8 divisors (see below), whose sum is σ = 186343040. Its totient is φ = 137068416.

The previous prime is 161481637. The next prime is 161481679. The reversal of 161481649 is 946184161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161481649 - 2¹¹ = 161479601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161481629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111264 + ... + 112705.

It is an arithmetic number, because the mean of its divisors is an integer number (23292880).

Almost surely, 2^161481649 is an apocalyptic number.

It is an amenable number.

161481649 is a deficient number, since it is larger than the sum of its proper divisors (24861391).

161481649 is a wasteful number, since it uses less digits than its factorization.

161481649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224079.

The product of its digits is 41472, while the sum is 40.

The square root of 161481649 is about 12707.5429961893. The cubic root of 161481649 is about 544.5541329909.

The spelling of 161481649 in words is "one hundred sixty-one million, four hundred eighty-one thousand, six hundred forty-nine".