1249504243 has 4 divisors (see below), whose sum is σ = 1345619968. Its totient is φ = 1153388520.

The previous prime is 1249504241. The next prime is 1249504247. The reversal of 1249504243 is 3424059421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3424059421 = 251 ⋅13641671.

It is a cyclic number.

It is not a de Polignac number, because 1249504243 - 2¹ = 1249504241 is a prime.

It is a super-2 number, since 2×1249504243² = 3122521706550006098, 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 = 1249504199 and 1249504208.

It is not an unprimeable number, because it can be changed into a prime (1249504241) 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, 48057843 + ... + 48057868.

It is an arithmetic number, because the mean of its divisors is an integer number (336404992).

Almost surely, 2^1249504243 is an apocalyptic number.

1249504243 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1249504243 is a deficient number, since it is larger than the sum of its proper divisors (96115725).

1249504243 is an equidigital number, since it uses as much as digits as its factorization.

1249504243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96115724.

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 1249504243 is about 35348.3273013024. The cubic root of 1249504243 is about 1077.0749160411.

The spelling of 1249504243 in words is "one billion, two hundred forty-nine million, five hundred four thousand, two hundred forty-three".