561838949 has 36 divisors (see below), whose sum is σ = 707119200. Its totient is φ = 443862720.

The previous prime is 561838939. The next prime is 561838951. The reversal of 561838949 is 949838165.

It is a de Polignac number, because none of the positive numbers 2^k-561838949 is a prime.

It is a super-2 number, since 2×561838949² = 631326009226849202, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 561838949.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561838909) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1564832 + ... + 1565190.

It is an arithmetic number, because the mean of its divisors is an integer number (19642200).

Almost surely, 2^561838949 is an apocalyptic number.

It is an amenable number.

561838949 is a deficient number, since it is larger than the sum of its proper divisors (145280251).

561838949 is a wasteful number, since it uses less digits than its factorization.

561838949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474 (or 426 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 53.

The square root of 561838949 is about 23703.1421756695. The cubic root of 561838949 is about 825.1583162351.

The spelling of 561838949 in words is "five hundred sixty-one million, eight hundred thirty-eight thousand, nine hundred forty-nine".