161115510 has 16 divisors (see below), whose sum is σ = 386677296. Its totient is φ = 42964128.

The previous prime is 161115481. The next prime is 161115517. The reversal of 161115510 is 15511161.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161115517) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2685229 + ... + 2685288.

It is an arithmetic number, because the mean of its divisors is an integer number (24167331).

Almost surely, 2^161115510 is an apocalyptic number.

161115510 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161115510 is an abundant number, since it is smaller than the sum of its proper divisors (225561786).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161115510 is a wasteful number, since it uses less digits than its factorization.

161115510 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5370527.

The product of its (nonzero) digits is 150, while the sum is 21.

The square root of 161115510 is about 12693.1284559796. The cubic root of 161115510 is about 544.1422525730.

Adding to 161115510 its reverse (15511161), we get a palindrome (176626671).

The spelling of 161115510 in words is "one hundred sixty-one million, one hundred fifteen thousand, five hundred ten".