52991561 has 8 divisors (see below), whose sum is σ = 60830400. Its totient is φ = 45219888.

The previous prime is 52991531. The next prime is 52991581. The reversal of 52991561 is 16519925.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 52991561 - 2¹⁰ = 52990537 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (52991501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15086 + ... + 18263.

It is an arithmetic number, because the mean of its divisors is an integer number (7603800).

Almost surely, 2^52991561 is an apocalyptic number.

It is an amenable number.

52991561 is a deficient number, since it is larger than the sum of its proper divisors (7838839).

52991561 is a wasteful number, since it uses less digits than its factorization.

52991561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33583.

The product of its digits is 24300, while the sum is 38.

The square root of 52991561 is about 7279.5302733075. The cubic root of 52991561 is about 375.6086377000.

The spelling of 52991561 in words is "fifty-two million, nine hundred ninety-one thousand, five hundred sixty-one".