1225561097 has 4 divisors (see below), whose sum is σ = 1226250240. Its totient is φ = 1224871956.

The previous prime is 1225561091. The next prime is 1225561109. The reversal of 1225561097 is 7901655221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7901655221 = 23 ⋅343550227.

It is a cyclic number.

It is not a de Polignac number, because 1225561097 - 2⁴ = 1225561081 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 1225561097.

It is not an unprimeable number, because it can be changed into a prime (1225561091) 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, 341897 + ... + 345462.

It is an arithmetic number, because the mean of its divisors is an integer number (306562560).

Almost surely, 2^1225561097 is an apocalyptic number.

It is an amenable number.

1225561097 is a deficient number, since it is larger than the sum of its proper divisors (689143).

1225561097 is an equidigital number, since it uses as much as digits as its factorization.

1225561097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 689142.

The product of its (nonzero) digits is 37800, while the sum is 38.

The square root of 1225561097 is about 35008.0147537675. The cubic root of 1225561097 is about 1070.1508207352.

The spelling of 1225561097 in words is "one billion, two hundred twenty-five million, five hundred sixty-one thousand, ninety-seven".