1226691 has 8 divisors (see below), whose sum is σ = 1817360. Its totient is φ = 817776.

The previous prime is 1226683. The next prime is 1226699. The reversal of 1226691 is 1966221.

It is an interprime number because it is at equal distance from previous prime (1226683) and next prime (1226699).

It is not a de Polignac number, because 1226691 - 2³ = 1226683 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 45433 = 1226691 / (1 + 2 + 2 + 6 + 6 + 9 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1226699) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22690 + ... + 22743.

It is an arithmetic number, because the mean of its divisors is an integer number (227170).

2^1226691 is an apocalyptic number.

1226691 is a deficient number, since it is larger than the sum of its proper divisors (590669).

1226691 is an equidigital number, since it uses as much as digits as its factorization.

1226691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45442 (or 45436 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 1226691 is about 1107.5608335437. The cubic root of 1226691 is about 107.0479594013.

Subtracting from 1226691 its product of digits (1296), we obtain a triangular number (1225395 = T₁₅₆₅).

The spelling of 1226691 in words is "one million, two hundred twenty-six thousand, six hundred ninety-one".