161490521 has 8 divisors (see below), whose sum is σ = 169646400. Its totient is φ = 153429232.

The previous prime is 161490491. The next prime is 161490541. The reversal of 161490521 is 125094161.

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 161490521 - 2²⁶ = 94381657 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161490541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20135 + ... + 26988.

It is an arithmetic number, because the mean of its divisors is an integer number (21205800).

Almost surely, 2^161490521 is an apocalyptic number.

It is an amenable number.

161490521 is a deficient number, since it is larger than the sum of its proper divisors (8155879).

161490521 is a wasteful number, since it uses less digits than its factorization.

161490521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47295.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 161490521 is about 12707.8920753994. The cubic root of 161490521 is about 544.5641056325.

The spelling of 161490521 in words is "one hundred sixty-one million, four hundred ninety thousand, five hundred twenty-one".