1225515554 has 16 divisors (see below), whose sum is σ = 1890302400. Its totient is φ = 595455984.

The previous prime is 1225515521. The next prime is 1225515581. The reversal of 1225515554 is 4555155221.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52217 + ... + 71955.

It is an arithmetic number, because the mean of its divisors is an integer number (118143900).

Almost surely, 2^1225515554 is an apocalyptic number.

1225515554 is a deficient number, since it is larger than the sum of its proper divisors (664786846).

1225515554 is a wasteful number, since it uses less digits than its factorization.

1225515554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20617.

The product of its digits is 50000, while the sum is 35.

The square root of 1225515554 is about 35007.3642823906. The cubic root of 1225515554 is about 1070.1375646348.

The spelling of 1225515554 in words is "one billion, two hundred twenty-five million, five hundred fifteen thousand, five hundred fifty-four".