1249564423 has 4 divisors (see below), whose sum is σ = 1249645320. Its totient is φ = 1249483528.

The previous prime is 1249564397. The next prime is 1249564427. The reversal of 1249564423 is 3244659421.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3244659421 = 631 ⋅5142091.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1249564423 is a prime.

It is a super-2 number, since 2×1249564423² = 3122822494454645858, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1249564427) 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, 9265 + ... + 50842.

It is an arithmetic number, because the mean of its divisors is an integer number (312411330).

Almost surely, 2^1249564423 is an apocalyptic number.

1249564423 is a deficient number, since it is larger than the sum of its proper divisors (80897).

1249564423 is an equidigital number, since it uses as much as digits as its factorization.

1249564423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80896.

The product of its digits is 207360, while the sum is 40.

The square root of 1249564423 is about 35349.1785335954. The cubic root of 1249564423 is about 1077.0922075197.

The spelling of 1249564423 in words is "one billion, two hundred forty-nine million, five hundred sixty-four thousand, four hundred twenty-three".