1225797091 has 8 divisors (see below), whose sum is σ = 1249498224. Its totient is φ = 1202117280.

The previous prime is 1225797077. The next prime is 1225797113. The reversal of 1225797091 is 1907975221.

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 1225797091 - 2⁷ = 1225796963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1225797031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 158781 + ... + 166321.

It is an arithmetic number, because the mean of its divisors is an integer number (156187278).

Almost surely, 2^1225797091 is an apocalyptic number.

1225797091 is a deficient number, since it is larger than the sum of its proper divisors (23701133).

1225797091 is an equidigital number, since it uses as much as digits as its factorization.

1225797091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10661.

The product of its (nonzero) digits is 79380, while the sum is 43.

The square root of 1225797091 is about 35011.3851625439. The cubic root of 1225797091 is about 1070.2195057276.

The spelling of 1225797091 in words is "one billion, two hundred twenty-five million, seven hundred ninety-seven thousand, ninety-one".