1306644331 has 4 divisors (see below), whose sum is σ = 1313944200. Its totient is φ = 1299344464.

The previous prime is 1306644319. The next prime is 1306644347. The reversal of 1306644331 is 1334466031.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1334466031 = 2141 ⋅623291.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1306644331 is a prime.

It is a super-2 number, since 2×1306644331² = 3414638815468875122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1306644293 and 1306644302.

It is not an unprimeable number, because it can be changed into a prime (1306644431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3649666 + ... + 3650023.

It is an arithmetic number, because the mean of its divisors is an integer number (328486050).

Almost surely, 2^1306644331 is an apocalyptic number.

1306644331 is a deficient number, since it is larger than the sum of its proper divisors (7299869).

1306644331 is an equidigital number, since it uses as much as digits as its factorization.

1306644331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7299868.

The product of its (nonzero) digits is 15552, while the sum is 31.

The square root of 1306644331 is about 36147.5356144786. The cubic root of 1306644331 is about 1093.2491025999.

The spelling of 1306644331 in words is "one billion, three hundred six million, six hundred forty-four thousand, three hundred thirty-one".