161155515 has 32 divisors (see below), whose sum is σ = 268609536. Its totient is φ = 82414080.

The previous prime is 161155513. The next prime is 161155517. The reversal of 161155515 is 515551161.

It is an interprime number because it is at equal distance from previous prime (161155513) and next prime (161155517).

It is not a de Polignac number, because 161155515 - 2¹ = 161155513 is a prime.

It is a super-2 number, since 2×161155515² = 51942200029830450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161155513) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 51012 + ... + 54078.

It is an arithmetic number, because the mean of its divisors is an integer number (8394048).

Almost surely, 2^161155515 is an apocalyptic number.

161155515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

161155515 is a deficient number, since it is larger than the sum of its proper divisors (107454021).

161155515 is a wasteful number, since it uses less digits than its factorization.

161155515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3219.

The product of its digits is 3750, while the sum is 30.

The square root of 161155515 is about 12694.7042108117. The cubic root of 161155515 is about 544.1872857076.

The spelling of 161155515 in words is "one hundred sixty-one million, one hundred fifty-five thousand, five hundred fifteen".