52021561 has 4 divisors (see below), whose sum is σ = 54283392. Its totient is φ = 49759732.

The previous prime is 52021559. The next prime is 52021583. The reversal of 52021561 is 16512025.

52021561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 52021561 - 2¹ = 52021559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (52021511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1130881 + ... + 1130926.

It is an arithmetic number, because the mean of its divisors is an integer number (13570848).

Almost surely, 2^52021561 is an apocalyptic number.

It is an amenable number.

52021561 is a deficient number, since it is larger than the sum of its proper divisors (2261831).

52021561 is a wasteful number, since it uses less digits than its factorization.

52021561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2261830.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 52021561 is about 7212.5973823582. The cubic root of 52021561 is about 373.3026961643.

Adding to 52021561 its reverse (16512025), we get a palindrome (68533586).

The spelling of 52021561 in words is "fifty-two million, twenty-one thousand, five hundred sixty-one".