1015225561 has 24 divisors (see below), whose sum is σ = 1199192904. Its totient is φ = 856880640.

The previous prime is 1015225553. The next prime is 1015225583. The reversal of 1015225561 is 1655225101.

1015225561 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 365995161 + 649230400 = 19131^2 + 25480^2 .

It is not a de Polignac number, because 1015225561 - 2³ = 1015225553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1015225061) 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, 1001691 + ... + 1002703.

It is an arithmetic number, because the mean of its divisors is an integer number (49966371).

Almost surely, 2^1015225561 is an apocalyptic number.

It is an amenable number.

1015225561 is a deficient number, since it is larger than the sum of its proper divisors (183967343).

1015225561 is a wasteful number, since it uses less digits than its factorization.

1015225561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1321 (or 1314 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 28.

The square root of 1015225561 is about 31862.6044290168. The cubic root of 1015225561 is about 1005.0496451636.

It can be divided in two parts, 1015 and 225561, that added together give a square (226576 = 476²).

The spelling of 1015225561 in words is "one billion, fifteen million, two hundred twenty-five thousand, five hundred sixty-one".