1225555899 has 16 divisors (see below), whose sum is σ = 1661731200. Its totient is φ = 803312576.

The previous prime is 1225555883. The next prime is 1225555913. The reversal of 1225555899 is 9985555221.

It is not a de Polignac number, because 1225555899 - 2⁴ = 1225555883 is a prime.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (1225557899) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34972 + ... + 60614.

It is an arithmetic number, because the mean of its divisors is an integer number (103858200).

Almost surely, 2^1225555899 is an apocalyptic number.

1225555899 is a deficient number, since it is larger than the sum of its proper divisors (436175301).

1225555899 is a wasteful number, since it uses less digits than its factorization.

1225555899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25914.

The product of its digits is 1620000, while the sum is 51.

The square root of 1225555899 is about 35007.9405135464. The cubic root of 1225555899 is about 1070.1493077814.

The spelling of 1225555899 in words is "one billion, two hundred twenty-five million, five hundred fifty-five thousand, eight hundred ninety-nine".