1313261636 has 24 divisors (see below), whose sum is σ = 2480829120. Its totient is φ = 606422432.

The previous prime is 1313261633. The next prime is 1313261657. The reversal of 1313261636 is 6361623131.

It is a super-2 number, since 2×1313261636² = 3449312249178792992, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1313261633) 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, 243446 + ... + 248781.

It is an arithmetic number, because the mean of its divisors is an integer number (103367880).

Almost surely, 2^1313261636 is an apocalyptic number.

It is an amenable number.

1313261636 is a deficient number, since it is larger than the sum of its proper divisors (1167567484).

1313261636 is a wasteful number, since it uses less digits than its factorization.

1313261636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492283 (or 492281 counting only the distinct ones).

The product of its digits is 11664, while the sum is 32.

The square root of 1313261636 is about 36238.9519164117. The cubic root of 1313261636 is about 1095.0915281109.

Adding to 1313261636 its reverse (6361623131), we get a palindrome (7674884767).

The spelling of 1313261636 in words is "one billion, three hundred thirteen million, two hundred sixty-one thousand, six hundred thirty-six".