1015505685 has 24 divisors (see below), whose sum is σ = 1760983224. Its totient is φ = 541365120.

The previous prime is 1015505681. The next prime is 1015505773. The reversal of 1015505685 is 5865055101.

1015505685 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 199317924 + 816187761 = 14118^2 + 28569^2 .

It is not a de Polignac number, because 1015505685 - 2² = 1015505681 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1015505681) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 156159 + ... + 162531.

It is an arithmetic number, because the mean of its divisors is an integer number (73374301).

Almost surely, 2^1015505685 is an apocalyptic number.

1015505685 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1015505685 is a deficient number, since it is larger than the sum of its proper divisors (745477539).

1015505685 is a wasteful number, since it uses less digits than its factorization.

1015505685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9925 (or 9922 counting only the distinct ones).

The product of its (nonzero) digits is 30000, while the sum is 36.

The square root of 1015505685 is about 31866.9999372392. Note that the first 4 decimals coincide. The cubic root of 1015505685 is about 1005.1420754067.

The spelling of 1015505685 in words is "one billion, fifteen million, five hundred five thousand, six hundred eighty-five".