161243515 has 16 divisors (see below), whose sum is σ = 195468768. Its totient is φ = 127685376.

The previous prime is 161243491. The next prime is 161243527. The reversal of 161243515 is 515342161.

It is a cyclic number.

It is not a de Polignac number, because 161243515 - 2¹³ = 161235323 is a prime.

It is a super-2 number, since 2×161243515² = 51998942259110450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 308044 + ... + 308566.

It is an arithmetic number, because the mean of its divisors is an integer number (12216798).

Almost surely, 2^161243515 is an apocalyptic number.

161243515 is a deficient number, since it is larger than the sum of its proper divisors (34225253).

161243515 is a wasteful number, since it uses less digits than its factorization.

161243515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1038.

The product of its digits is 3600, while the sum is 28.

The square root of 161243515 is about 12698.1697500073. The cubic root of 161243515 is about 544.2863200000.

Adding to 161243515 its reverse (515342161), we get a palindrome (676585676).

The spelling of 161243515 in words is "one hundred sixty-one million, two hundred forty-three thousand, five hundred fifteen".