1313486249 has 4 divisors (see below), whose sum is σ = 1390750164. Its totient is φ = 1236222336.

The previous prime is 1313486243. The next prime is 1313486269. The reversal of 1313486249 is 9426843131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9426843131 = 29411 ⋅320521.

It can be written as a sum of positive squares in 2 ways, for example, as 1108423849 + 205062400 = 33293^2 + 14320^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1313486249 is a prime.

It is a super-2 number, since 2×1313486249² = 3450492252624180002, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1313486243) 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, 38631932 + ... + 38631965.

It is an arithmetic number, because the mean of its divisors is an integer number (347687541).

Almost surely, 2^1313486249 is an apocalyptic number.

It is an amenable number.

1313486249 is a deficient number, since it is larger than the sum of its proper divisors (77263915).

1313486249 is an equidigital number, since it uses as much as digits as its factorization.

1313486249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77263914.

The product of its digits is 124416, while the sum is 41.

The square root of 1313486249 is about 36242.0508387701. The cubic root of 1313486249 is about 1095.1539573494.

The spelling of 1313486249 in words is "one billion, three hundred thirteen million, four hundred eighty-six thousand, two hundred forty-nine".