1225815955 has 32 divisors (see below), whose sum is σ = 1814400000. Its totient is φ = 774202752.

The previous prime is 1225815947. The next prime is 1225815973. The reversal of 1225815955 is 5595185221.

It is a cyclic number.

It is not a de Polignac number, because 1225815955 - 2³ = 1225815947 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 224346 + ... + 229744.

It is an arithmetic number, because the mean of its divisors is an integer number (56700000).

Almost surely, 2^1225815955 is an apocalyptic number.

1225815955 is a deficient number, since it is larger than the sum of its proper divisors (588584045).

1225815955 is a wasteful number, since it uses less digits than its factorization.

1225815955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5923.

The product of its digits is 180000, while the sum is 43.

The square root of 1225815955 is about 35011.6545595892. The cubic root of 1225815955 is about 1070.2249956295.

The spelling of 1225815955 in words is "one billion, two hundred twenty-five million, eight hundred fifteen thousand, nine hundred fifty-five".