1225545578 has 4 divisors (see below), whose sum is σ = 1838318370. Its totient is φ = 612772788.

The previous prime is 1225545577. The next prime is 1225545613. The reversal of 1225545578 is 8755455221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8755455221 = 29 ⋅301912249.

It can be written as a sum of positive squares in only one way, i.e., 1071711169 + 153834409 = 32737^2 + 12403^2 .

It is not an unprimeable number, because it can be changed into a prime (1225545577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 306386393 + ... + 306386396.

Almost surely, 2^1225545578 is an apocalyptic number.

1225545578 is a deficient number, since it is larger than the sum of its proper divisors (612772792).

1225545578 is an equidigital number, since it uses as much as digits as its factorization.

1225545578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612772791.

The product of its digits is 560000, while the sum is 44.

The square root of 1225545578 is about 35007.7931038219. The cubic root of 1225545578 is about 1070.1463036910.

The spelling of 1225545578 in words is "one billion, two hundred twenty-five million, five hundred forty-five thousand, five hundred seventy-eight".