1249662613 has 4 divisors (see below), whose sum is σ = 1249736608. Its totient is φ = 1249588620.

The previous prime is 1249662599. The next prime is 1249662629. The reversal of 1249662613 is 3162669421.

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: 3162669421 = 12409 ⋅254869.

It is a cyclic number.

It is not a de Polignac number, because 1249662613 - 2⁵ = 1249662581 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 (1249662643) 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, 2128 + ... + 50038.

It is an arithmetic number, because the mean of its divisors is an integer number (312434152).

Almost surely, 2^1249662613 is an apocalyptic number.

It is an amenable number.

1249662613 is a deficient number, since it is larger than the sum of its proper divisors (73995).

1249662613 is an equidigital number, since it uses as much as digits as its factorization.

1249662613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73994.

The product of its digits is 93312, while the sum is 40.

The square root of 1249662613 is about 35350.5673646124. The cubic root of 1249662613 is about 1077.1204191941.

The spelling of 1249662613 in words is "one billion, two hundred forty-nine million, six hundred sixty-two thousand, six hundred thirteen".