1249666517 has 4 divisors (see below), whose sum is σ = 1363272576. Its totient is φ = 1136060460.

The previous prime is 1249666493. The next prime is 1249666519. The reversal of 1249666517 is 7156669421.

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.

It is a cyclic number.

It is not a de Polignac number, because 1249666517 - 2¹⁰ = 1249665493 is a prime.

It is a super-2 number, since 2×1249666517² = 3123332807421822578, 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 (1249666519) 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, 56803013 + ... + 56803034.

It is an arithmetic number, because the mean of its divisors is an integer number (340818144).

Almost surely, 2^1249666517 is an apocalyptic number.

It is an amenable number.

1249666517 is a deficient number, since it is larger than the sum of its proper divisors (113606059).

1249666517 is a wasteful number, since it uses less digits than its factorization.

1249666517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113606058.

The product of its digits is 544320, while the sum is 47.

The square root of 1249666517 is about 35350.6225829192. The cubic root of 1249666517 is about 1077.1215408499.

It can be divided in two parts, 1249 and 666517, that added together give a palindrome (667766).

The spelling of 1249666517 in words is "one billion, two hundred forty-nine million, six hundred sixty-six thousand, five hundred seventeen".