1015561120 has 48 divisors (see below), whose sum is σ = 2742018048. Its totient is φ = 348192000.

The previous prime is 1015561093. The next prime is 1015561139. The reversal of 1015561120 is 211655101.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1015561091 and 1015561100.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 452256 + ... + 454495.

It is an arithmetic number, because the mean of its divisors is an integer number (57125376).

Almost surely, 2^1015561120 is an apocalyptic number.

1015561120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1015561120 is an abundant number, since it is smaller than the sum of its proper divisors (1726456928).

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

1015561120 is an equidigital number, since it uses as much as digits as its factorization.

1015561120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 906773 (or 906765 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 22.

The square root of 1015561120 is about 31867.8697122980. The cubic root of 1015561120 is about 1005.1603648291.

The spelling of 1015561120 in words is "one billion, fifteen million, five hundred sixty-one thousand, one hundred twenty".