52501561 has 4 divisors (see below), whose sum is σ = 60001792. Its totient is φ = 45001332.

The previous prime is 52501543. The next prime is 52501577. The reversal of 52501561 is 16510525.

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 52501561 - 2⁵ = 52501529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (52501591) 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 3 ways as a sum of consecutive naturals, for example, 3750105 + ... + 3750118.

It is an arithmetic number, because the mean of its divisors is an integer number (15000448).

Almost surely, 2^52501561 is an apocalyptic number.

It is an amenable number.

52501561 is a deficient number, since it is larger than the sum of its proper divisors (7500231).

52501561 is an equidigital number, since it uses as much as digits as its factorization.

52501561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7500230.

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 52501561 is about 7245.7960915278. The cubic root of 52501561 is about 374.4473304765.

The spelling of 52501561 in words is "fifty-two million, five hundred one thousand, five hundred sixty-one".