1253561 has 4 divisors (see below), whose sum is σ = 1255824. Its totient is φ = 1251300.

The previous prime is 1253557. The next prime is 1253587. The reversal of 1253561 is 1653521.

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 1253561 - 2² = 1253557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1253521) 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, 326 + ... + 1616.

It is an arithmetic number, because the mean of its divisors is an integer number (313956).

2^1253561 is an apocalyptic number.

It is an amenable number.

1253561 is a deficient number, since it is larger than the sum of its proper divisors (2263).

1253561 is an equidigital number, since it uses as much as digits as its factorization.

1253561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2262.

The product of its digits is 900, while the sum is 23.

The square root of 1253561 is about 1119.6253837780. The cubic root of 1253561 is about 107.8239300771.

The spelling of 1253561 in words is "one million, two hundred fifty-three thousand, five hundred sixty-one".