1225917091 has 4 divisors (see below), whose sum is σ = 1401048112. Its totient is φ = 1050786072.

The previous prime is 1225917079. The next prime is 1225917131. The reversal of 1225917091 is 1907195221.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1225917091 - 2⁵ = 1225917059 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1225917091.

It is not an unprimeable number, because it can be changed into a prime (1225917071) 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, 87565500 + ... + 87565513.

It is an arithmetic number, because the mean of its divisors is an integer number (350262028).

Almost surely, 2^1225917091 is an apocalyptic number.

1225917091 is a deficient number, since it is larger than the sum of its proper divisors (175131021).

1225917091 is an equidigital number, since it uses as much as digits as its factorization.

1225917091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175131020.

The product of its (nonzero) digits is 11340, while the sum is 37.

The square root of 1225917091 is about 35013.0988488594. The cubic root of 1225917091 is about 1070.2544278071.

The spelling of 1225917091 in words is "one billion, two hundred twenty-five million, nine hundred seventeen thousand, ninety-one".