1249087799 has 4 divisors (see below), whose sum is σ = 1258923264. Its totient is φ = 1239252336.

The previous prime is 1249087787. The next prime is 1249087823. The reversal of 1249087799 is 9977809421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9977809421 = 509 ⋅19602769.

It is a cyclic number.

It is not a de Polignac number, because 1249087799 - 2²⁰ = 1248039223 is a prime.

It is a super-2 number, since 2×1249087799² = 3120440659221328802, 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 (1249087769) 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, 4917542 + ... + 4917795.

It is an arithmetic number, because the mean of its divisors is an integer number (314730816).

Almost surely, 2^1249087799 is an apocalyptic number.

1249087799 is a deficient number, since it is larger than the sum of its proper divisors (9835465).

1249087799 is an equidigital number, since it uses as much as digits as its factorization.

1249087799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9835464.

The product of its (nonzero) digits is 2286144, while the sum is 56.

The square root of 1249087799 is about 35342.4362346457. The cubic root of 1249087799 is about 1076.9552442515.

The spelling of 1249087799 in words is "one billion, two hundred forty-nine million, eighty-seven thousand, seven hundred ninety-nine".