1225663231 has 4 divisors (see below), whose sum is σ = 1319945032. Its totient is φ = 1131381432.

The previous prime is 1225663217. The next prime is 1225663237. The reversal of 1225663231 is 1323665221.

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: 1323665221 = 107 ⋅12370703.

It is a cyclic number.

It is not a de Polignac number, because 1225663231 - 2¹¹ = 1225661183 is a prime.

It is a super-2 number, since 2×1225663231² = 3004500711650718722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1225663193 and 1225663202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225663237) 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, 47140881 + ... + 47140906.

It is an arithmetic number, because the mean of its divisors is an integer number (329986258).

Almost surely, 2^1225663231 is an apocalyptic number.

1225663231 is a deficient number, since it is larger than the sum of its proper divisors (94281801).

1225663231 is an equidigital number, since it uses as much as digits as its factorization.

1225663231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94281800.

The product of its digits is 12960, while the sum is 31.

The square root of 1225663231 is about 35009.4734464830. The cubic root of 1225663231 is about 1070.1805474587.

The spelling of 1225663231 in words is "one billion, two hundred twenty-five million, six hundred sixty-three thousand, two hundred thirty-one".