1249591243 has 2 divisors, whose sum is σ = 1249591244. Its totient is φ = 1249591242.

The previous prime is 1249591241. The next prime is 1249591249. The reversal of 1249591243 is 3421959421.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1249591243 - 2¹ = 1249591241 is a prime.

It is a super-2 number, since 2×1249591243² = 3122956549164570098, which contains 22 as substring.

Together with 1249591241, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1249591196 and 1249591205.

It is not a weakly prime, because it can be changed into another prime (1249591241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 624795621 + 624795622.

It is an arithmetic number, because the mean of its divisors is an integer number (624795622).

Almost surely, 2^1249591243 is an apocalyptic number.

1249591243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1249591243 is an equidigital number, since it uses as much as digits as its factorization.

1249591243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 40.

The square root of 1249591243 is about 35349.5578897389. The cubic root of 1249591243 is about 1077.0999135133.

The spelling of 1249591243 in words is "one billion, two hundred forty-nine million, five hundred ninety-one thousand, two hundred forty-three".