1230661 has 4 divisors (see below), whose sum is σ = 1284192. Its totient is φ = 1177132.

The previous prime is 1230637. The next prime is 1230667. The reversal of 1230661 is 1660321.

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: 1660321 = 13 ⋅127717.

It is a cyclic number.

It is not a de Polignac number, because 1230661 - 2⁵ = 1230629 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 (1230667) 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, 26731 + ... + 26776.

It is an arithmetic number, because the mean of its divisors is an integer number (321048).

2^1230661 is an apocalyptic number.

It is an amenable number.

1230661 is a deficient number, since it is larger than the sum of its proper divisors (53531).

1230661 is an equidigital number, since it uses as much as digits as its factorization.

1230661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53530.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 1230661 is about 1109.3516124295. The cubic root of 1230661 is about 107.1633165585.

Adding to 1230661 its reverse (1660321), we get a palindrome (2890982).

It can be divided in two parts, 1230 and 661, that added together give a triangular number (1891 = T₆₁).

The spelling of 1230661 in words is "one million, two hundred thirty thousand, six hundred sixty-one".