561651340 has 24 divisors (see below), whose sum is σ = 1191631392. Its totient is φ = 222343680.

The previous prime is 561651331. The next prime is 561651341. The reversal of 561651340 is 43156165.

It is not an unprimeable number, because it can be changed into a prime (561651341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142816 + ... + 146695.

It is an arithmetic number, because the mean of its divisors is an integer number (49651308).

Almost surely, 2^561651340 is an apocalyptic number.

It is an amenable number.

561651340 is an abundant number, since it is smaller than the sum of its proper divisors (629980052).

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

561651340 is a wasteful number, since it uses less digits than its factorization.

561651340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289617 (or 289615 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 561651340 is about 23699.1843741509. The cubic root of 561651340 is about 825.0664605167.

The spelling of 561651340 in words is "five hundred sixty-one million, six hundred fifty-one thousand, three hundred forty".