561215545 has 12 divisors (see below), whose sum is σ = 740248740. Its totient is φ = 408156320.

The previous prime is 561215533. The next prime is 561215549. The reversal of 561215545 is 545512165.

561215545 = T₂₉₈₅ + T₂₉₈₆ + ... + T₃₁₀₅.

561215545 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 2 ways, for example, as 100641024 + 460574521 = 10032^2 + 21461^2 .

It is not a de Polignac number, because 561215545 - 2⁵ = 561215513 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 561215545.

It is not an unprimeable number, because it can be changed into a prime (561215549) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 463210 + ... + 464419.

It is an arithmetic number, because the mean of its divisors is an integer number (61687395).

Almost surely, 2^561215545 is an apocalyptic number.

561215545 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

561215545 is a deficient number, since it is larger than the sum of its proper divisors (179033195).

561215545 is a wasteful number, since it uses less digits than its factorization.

561215545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 927656 (or 927645 counting only the distinct ones).

The product of its digits is 30000, while the sum is 34.

The square root of 561215545 is about 23689.9882861938. The cubic root of 561215545 is about 824.8530108497.

The spelling of 561215545 in words is "five hundred sixty-one million, two hundred fifteen thousand, five hundred forty-five".