1231225447 has 4 divisors (see below), whose sum is σ = 1231937640. Its totient is φ = 1230513256.

The previous prime is 1231225423. The next prime is 1231225453. The reversal of 1231225447 is 7445221321.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7445221321 = 14557 ⋅511453.

It is a cyclic number.

It is not a de Polignac number, because 1231225447 - 2⁷ = 1231225319 is a prime.

It is a super-2 number, since 2×1231225447² = 3031832202680699618, which contains 22 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 (1231225477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 353497 + ... + 356962.

It is an arithmetic number, because the mean of its divisors is an integer number (307984410).

Almost surely, 2^1231225447 is an apocalyptic number.

1231225447 is a deficient number, since it is larger than the sum of its proper divisors (712193).

1231225447 is an equidigital number, since it uses as much as digits as its factorization.

1231225447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 712192.

The product of its digits is 13440, while the sum is 31.

The square root of 1231225447 is about 35088.8222515376. The cubic root of 1231225447 is about 1071.7969766518.

Adding to 1231225447 its reverse (7445221321), we get a palindrome (8676446768).

The spelling of 1231225447 in words is "one billion, two hundred thirty-one million, two hundred twenty-five thousand, four hundred forty-seven".