1225817471 has 4 divisors (see below), whose sum is σ = 1290334200. Its totient is φ = 1161300744.

The previous prime is 1225817449. The next prime is 1225817491. The reversal of 1225817471 is 1747185221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1747185221 = 281 ⋅6217741.

It is a cyclic number.

It is not a de Polignac number, because 1225817471 - 2³⁰ = 152075647 is a prime.

It is a super-3 number, since 3×1225817471³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225817441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32258336 + ... + 32258373.

It is an arithmetic number, because the mean of its divisors is an integer number (322583550).

Almost surely, 2^1225817471 is an apocalyptic number.

1225817471 is a deficient number, since it is larger than the sum of its proper divisors (64516729).

1225817471 is an equidigital number, since it uses as much as digits as its factorization.

1225817471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64516728.

The product of its digits is 31360, while the sum is 38.

The square root of 1225817471 is about 35011.6762095162. The cubic root of 1225817471 is about 1070.2254368215.

The spelling of 1225817471 in words is "one billion, two hundred twenty-five million, eight hundred seventeen thousand, four hundred seventy-one".