161522315 has 32 divisors (see below), whose sum is σ = 207463680. Its totient is φ = 120515584.

The previous prime is 161522311. The next prime is 161522341. The reversal of 161522315 is 513225161.

It is a cyclic number.

It is not a de Polignac number, because 161522315 - 2² = 161522311 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161522311) 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 31 ways as a sum of consecutive naturals, for example, 933569 + ... + 933741.

It is an arithmetic number, because the mean of its divisors is an integer number (6483240).

Almost surely, 2^161522315 is an apocalyptic number.

161522315 is a deficient number, since it is larger than the sum of its proper divisors (45941365).

161522315 is a wasteful number, since it uses less digits than its factorization.

161522315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391.

The product of its digits is 1800, while the sum is 26.

The square root of 161522315 is about 12709.1429687450. The cubic root of 161522315 is about 544.5998409292.

Adding to 161522315 its reverse (513225161), we get a palindrome (674747476).

The spelling of 161522315 in words is "one hundred sixty-one million, five hundred twenty-two thousand, three hundred fifteen".