561497181 has 32 divisors (see below), whose sum is σ = 870912000. Its totient is φ = 315154560.

The previous prime is 561497171. The next prime is 561497197. The reversal of 561497181 is 181794165.

It is not a de Polignac number, because 561497181 - 2¹³ = 561488989 is a prime.

It is a super-2 number, since 2×561497181² = 630558168541893522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561497171) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 534745 + ... + 535793.

It is an arithmetic number, because the mean of its divisors is an integer number (27216000).

Almost surely, 2^561497181 is an apocalyptic number.

It is an amenable number.

561497181 is a deficient number, since it is larger than the sum of its proper divisors (309414819).

561497181 is a wasteful number, since it uses less digits than its factorization.

561497181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1489.

The product of its digits is 60480, while the sum is 42.

The square root of 561497181 is about 23695.9317394358. The cubic root of 561497181 is about 824.9909670269.

The spelling of 561497181 in words is "five hundred sixty-one million, four hundred ninety-seven thousand, one hundred eighty-one".