1225091 has 4 divisors (see below), whose sum is σ = 1400112. Its totient is φ = 1050072.

The previous prime is 1225087. The next prime is 1225093. The reversal of 1225091 is 1905221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1905221 = 1193 ⋅1597.

It is a cyclic number.

It is not a de Polignac number, because 1225091 - 2² = 1225087 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1225093) 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, 87500 + ... + 87513.

It is an arithmetic number, because the mean of its divisors is an integer number (350028).

2^1225091 is an apocalyptic number.

1225091 is a deficient number, since it is larger than the sum of its proper divisors (175021).

1225091 is an equidigital number, since it uses as much as digits as its factorization.

1225091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175020.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 1225091 is about 1106.8382899051. The cubic root of 1225091 is about 107.0013974837.

The spelling of 1225091 in words is "one million, two hundred twenty-five thousand, ninety-one".