1309747649 has 8 divisors (see below), whose sum is σ = 1497082368. Its totient is φ = 1122469920.

The previous prime is 1309747639. The next prime is 1309747651. The reversal of 1309747649 is 9467479031.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1309747649 - 2⁸ = 1309747393 is a prime.

It is a super-2 number, since 2×1309747649² = 3430877808122054402, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1309747597 and 1309747606.

It is not an unprimeable number, because it can be changed into a prime (1309747639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62789 + ... + 81005.

It is an arithmetic number, because the mean of its divisors is an integer number (187135296).

Almost surely, 2^1309747649 is an apocalyptic number.

It is an amenable number.

1309747649 is a deficient number, since it is larger than the sum of its proper divisors (187334719).

1309747649 is a wasteful number, since it uses less digits than its factorization.

1309747649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28495.

The product of its (nonzero) digits is 1143072, while the sum is 50.

The square root of 1309747649 is about 36190.4358774525. The cubic root of 1309747649 is about 1094.1139176983.

The spelling of 1309747649 in words is "one billion, three hundred nine million, seven hundred forty-seven thousand, six hundred forty-nine".