161641515 has 32 divisors (see below), whose sum is σ = 302455296. Its totient is φ = 72172800.

The previous prime is 161641499. The next prime is 161641537. The reversal of 161641515 is 515146161.

It is not a de Polignac number, because 161641515 - 2⁴ = 161641499 is a prime.

It is a super-2 number, since 2×161641515² = 52255958742990450, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13386 + ... + 22415.

It is an arithmetic number, because the mean of its divisors is an integer number (9451728).

Almost surely, 2^161641515 is an apocalyptic number.

161641515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

161641515 is a deficient number, since it is larger than the sum of its proper divisors (140813781).

161641515 is a wasteful number, since it uses less digits than its factorization.

161641515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35859.

The product of its digits is 3600, while the sum is 30.

The square root of 161641515 is about 12713.8316411694. The cubic root of 161641515 is about 544.7337756503.

Adding to 161641515 its reverse (515146161), we get a palindrome (676787676).

The spelling of 161641515 in words is "one hundred sixty-one million, six hundred forty-one thousand, five hundred fifteen".