1249865797 has 4 divisors (see below), whose sum is σ = 1249969600. Its totient is φ = 1249761996.

The previous prime is 1249865791. The next prime is 1249865803. The reversal of 1249865797 is 7975689421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 7975689421 = 7 ⋅1139384203.

It is an interprime number because it is at equal distance from previous prime (1249865791) and next prime (1249865803).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1249865797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1249865791) 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, 31047 + ... + 58852.

It is an arithmetic number, because the mean of its divisors is an integer number (312492400).

Almost surely, 2^1249865797 is an apocalyptic number.

It is an amenable number.

1249865797 is a deficient number, since it is larger than the sum of its proper divisors (103803).

1249865797 is an equidigital number, since it uses as much as digits as its factorization.

1249865797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103802.

The product of its digits is 7620480, while the sum is 58.

The square root of 1249865797 is about 35353.4410913563. The cubic root of 1249865797 is about 1077.1787927564.

The spelling of 1249865797 in words is "one billion, two hundred forty-nine million, eight hundred sixty-five thousand, seven hundred ninety-seven".