561511145 has 8 divisors (see below), whose sum is σ = 725645256. Its totient is φ = 414654336.

The previous prime is 561511081. The next prime is 561511147. The reversal of 561511145 is 541115165.

It can be written as a sum of positive squares in 4 ways, for example, as 8508889 + 553002256 = 2917^2 + 23516^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 561511145 - 2⁶ = 561511081 is a prime.

It is a super-2 number, since 2×561511145² = 630589531918422050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561511147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4319252 + ... + 4319381.

It is an arithmetic number, because the mean of its divisors is an integer number (90705657).

Almost surely, 2^561511145 is an apocalyptic number.

It is an amenable number.

561511145 is a deficient number, since it is larger than the sum of its proper divisors (164134111).

561511145 is a wasteful number, since it uses less digits than its factorization.

561511145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8638651.

The product of its digits is 3000, while the sum is 29.

The square root of 561511145 is about 23696.2263873386. The cubic root of 561511145 is about 824.9978059323.

The spelling of 561511145 in words is "five hundred sixty-one million, five hundred eleven thousand, one hundred forty-five".