1227661 has 4 divisors (see below), whose sum is σ = 1245024. Its totient is φ = 1210300.

The previous prime is 1227659. The next prime is 1227683. The reversal of 1227661 is 1667221.

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 1227661 - 2¹ = 1227659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1237661) 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, 8575 + ... + 8716.

It is an arithmetic number, because the mean of its divisors is an integer number (311256).

2^1227661 is an apocalyptic number.

It is an amenable number.

1227661 is a deficient number, since it is larger than the sum of its proper divisors (17363).

1227661 is an equidigital number, since it uses as much as digits as its factorization.

1227661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17362.

The product of its digits is 1008, while the sum is 25.

The square root of 1227661 is about 1107.9986462086. The cubic root of 1227661 is about 107.0761678535.

The spelling of 1227661 in words is "one million, two hundred twenty-seven thousand, six hundred sixty-one".