1520561 has 4 divisors (see below), whose sum is σ = 1737792. Its totient is φ = 1303332.

The previous prime is 1520549. The next prime is 1520579. The reversal of 1520561 is 1650251.

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: 1650251 = 491 ⋅3361.

It is a cyclic number.

It is not a de Polignac number, because 1520561 - 2¹⁸ = 1258417 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1520501) 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, 108605 + ... + 108618.

It is an arithmetic number, because the mean of its divisors is an integer number (434448).

2^1520561 is an apocalyptic number.

It is an amenable number.

1520561 is a deficient number, since it is larger than the sum of its proper divisors (217231).

1520561 is an equidigital number, since it uses as much as digits as its factorization.

1520561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217230.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 1520561 is about 1233.1102951480. The cubic root of 1520561 is about 114.9920851516.

The spelling of 1520561 in words is "one million, five hundred twenty thousand, five hundred sixty-one".