161020515 has 16 divisors (see below), whose sum is σ = 272788128. Its totient is φ = 80825856.

The previous prime is 161020507. The next prime is 161020529. The reversal of 161020515 is 515020161.

It is not a de Polignac number, because 161020515 - 2³ = 161020507 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161020491 and 161020500.

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, 315472 + ... + 315981.

It is an arithmetic number, because the mean of its divisors is an integer number (17049258).

Almost surely, 2^161020515 is an apocalyptic number.

161020515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

161020515 is a deficient number, since it is larger than the sum of its proper divisors (111767613).

161020515 is a wasteful number, since it uses less digits than its factorization.

161020515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 631478.

The product of its (nonzero) digits is 300, while the sum is 21.

The square root of 161020515 is about 12689.3859189482. The cubic root of 161020515 is about 544.0352879989.

Adding to 161020515 its reverse (515020161), we get a palindrome (676040676).

The spelling of 161020515 in words is "one hundred sixty-one million, twenty thousand, five hundred fifteen".