561158144 has 72 divisors (see below), whose sum is σ = 1157132340. Its totient is φ = 272056320.

The previous prime is 561158131. The next prime is 561158167. The reversal of 561158144 is 441851165.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3442607 + ... + 3442769.

Almost surely, 2^561158144 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 561158144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (578566170).

561158144 is an abundant number, since it is smaller than the sum of its proper divisors (595974196).

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

561158144 is an equidigital number, since it uses as much as digits as its factorization.

561158144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267 (or 206 counting only the distinct ones).

The product of its digits is 19200, while the sum is 35.

The square root of 561158144 is about 23688.7767518713. The cubic root of 561158144 is about 824.8248879640.

The spelling of 561158144 in words is "five hundred sixty-one million, one hundred fifty-eight thousand, one hundred forty-four".