1225817473 has 4 divisors (see below), whose sum is σ = 1228335040. Its totient is φ = 1223299908.

The previous prime is 1225817449. The next prime is 1225817491. The reversal of 1225817473 is 3747185221.

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: 3747185221 = 13 ⋅288245017.

It is a cyclic number.

It is not a de Polignac number, because 1225817473 - 2⁵ = 1225817441 is a prime.

It is a super-2 number, since 2×1225817473² = 3005256954224211458, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1225817273) 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, 1258053 + ... + 1259026.

It is an arithmetic number, because the mean of its divisors is an integer number (307083760).

Almost surely, 2^1225817473 is an apocalyptic number.

It is an amenable number.

1225817473 is a deficient number, since it is larger than the sum of its proper divisors (2517567).

1225817473 is an equidigital number, since it uses as much as digits as its factorization.

1225817473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2517566.

The product of its digits is 94080, while the sum is 40.

The square root of 1225817473 is about 35011.6762380781. The cubic root of 1225817473 is about 1070.2254374035.

The spelling of 1225817473 in words is "one billion, two hundred twenty-five million, eight hundred seventeen thousand, four hundred seventy-three".