1313531661 has 32 divisors (see below), whose sum is σ = 1905740928. Its totient is φ = 799960320.

The previous prime is 1313531651. The next prime is 1313531677. The reversal of 1313531661 is 1661353131.

1313531661 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1313531661 - 2⁷ = 1313531533 is a prime.

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1313531651) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2237410 + ... + 2237996.

It is an arithmetic number, because the mean of its divisors is an integer number (59554404).

Almost surely, 2^1313531661 is an apocalyptic number.

It is an amenable number.

1313531661 is a deficient number, since it is larger than the sum of its proper divisors (592209267).

1313531661 is a wasteful number, since it uses less digits than its factorization.

1313531661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1101.

The product of its digits is 4860, while the sum is 30.

The square root of 1313531661 is about 36242.6773431544. The cubic root of 1313531661 is about 1095.1665783566.

Adding to 1313531661 its reverse (1661353131), we get a palindrome (2974884792).

The spelling of 1313531661 in words is "one billion, three hundred thirteen million, five hundred thirty-one thousand, six hundred sixty-one".