1230991 has 8 divisors (see below), whose sum is σ = 1316480. Its totient is φ = 1147608.

The previous prime is 1230967. The next prime is 1230997. The reversal of 1230991 is 1990321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1230991 - 2⁷ = 1230863 is a prime.

It is the 1110-th Hogben number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1230997) by changing a digit.

It is a nontrivial repunit in base 1109.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 790 + ... + 1756.

It is an arithmetic number, because the mean of its divisors is an integer number (164560).

2^1230991 is an apocalyptic number.

1230991 is a deficient number, since it is larger than the sum of its proper divisors (85489).

1230991 is an equidigital number, since it uses as much as digits as its factorization.

1230991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1053.

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 1230991 is about 1109.5003379900. The cubic root of 1230991 is about 107.1728942662.

The spelling of 1230991 in words is "one million, two hundred thirty thousand, nine hundred ninety-one".