561953971 has 4 divisors (see below), whose sum is σ = 575022712. Its totient is φ = 548885232.

The previous prime is 561953893. The next prime is 561953981. The reversal of 561953971 is 179359165.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 561953971 - 2¹³ = 561945779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561953981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6534306 + ... + 6534391.

It is an arithmetic number, because the mean of its divisors is an integer number (143755678).

Almost surely, 2^561953971 is an apocalyptic number.

561953971 is a deficient number, since it is larger than the sum of its proper divisors (13068741).

561953971 is a wasteful number, since it uses less digits than its factorization.

561953971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13068740.

The product of its digits is 255150, while the sum is 46.

The square root of 561953971 is about 23705.5683542918. The cubic root of 561953971 is about 825.2146223372.

The spelling of 561953971 in words is "five hundred sixty-one million, nine hundred fifty-three thousand, nine hundred seventy-one".