561161040 has 80 divisors (see below), whose sum is σ = 1897753536. Its totient is φ = 136038400.

The previous prime is 561161033. The next prime is 561161047. The reversal of 561161040 is 40161165.

It is an interprime number because it is at equal distance from previous prime (561161033) and next prime (561161047).

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 561161040.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561161047) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103641 + ... + 108920.

Almost surely, 2^561161040 is an apocalyptic number.

It is an amenable number.

561161040 is an abundant number, since it is smaller than the sum of its proper divisors (1336592496).

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

561161040 is a wasteful number, since it uses less digits than its factorization.

561161040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212588 (or 212582 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 561161040 is about 23688.8378777854. The cubic root of 561161040 is about 824.8263068681.

The spelling of 561161040 in words is "five hundred sixty-one million, one hundred sixty-one thousand, forty".