561452521 has 4 divisors (see below), whose sum is σ = 641660032. Its totient is φ = 481245012.

The previous prime is 561452519. The next prime is 561452581. The reversal of 561452521 is 125254165.

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, and also an emirpimes, since its reverse is a distinct semiprime: 125254165 = 5 ⋅25050833.

It is a cyclic number.

It is not a de Polignac number, because 561452521 - 2¹ = 561452519 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561452581) 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, 40103745 + ... + 40103758.

It is an arithmetic number, because the mean of its divisors is an integer number (160415008).

Almost surely, 2^561452521 is an apocalyptic number.

It is an amenable number.

561452521 is a deficient number, since it is larger than the sum of its proper divisors (80207511).

561452521 is an equidigital number, since it uses as much as digits as its factorization.

561452521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80207510.

The product of its digits is 12000, while the sum is 31.

The square root of 561452521 is about 23694.9893648425. The cubic root of 561452521 is about 824.9690939141.

The spelling of 561452521 in words is "five hundred sixty-one million, four hundred fifty-two thousand, five hundred twenty-one".