1247561 has 4 divisors (see below), whose sum is σ = 1425792. Its totient is φ = 1069332.

The previous prime is 1247557. The next prime is 1247563. The reversal of 1247561 is 1657421.

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 1247561 - 2² = 1247557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 1247561.

It is not an unprimeable number, because it can be changed into a prime (1247563) 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, 89105 + ... + 89118.

It is an arithmetic number, because the mean of its divisors is an integer number (356448).

2^1247561 is an apocalyptic number.

It is an amenable number.

1247561 is a deficient number, since it is larger than the sum of its proper divisors (178231).

1247561 is an equidigital number, since it uses as much as digits as its factorization.

1247561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178230.

The product of its digits is 1680, while the sum is 26.

The square root of 1247561 is about 1116.9427022010. The cubic root of 1247561 is about 107.6516266675.

The spelling of 1247561 in words is "one million, two hundred forty-seven thousand, five hundred sixty-one".