1313473221 has 6 divisors (see below), whose sum is σ = 1897239110. Its totient is φ = 875648808.

The previous prime is 1313473177. The next prime is 1313473223. The reversal of 1313473221 is 1223743131.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1102904100 + 210569121 = 33210^2 + 14511^2 .

It is not a de Polignac number, because 1313473221 - 2⁷ = 1313473093 is a prime.

It is a super-2 number, since 2×1313473221² = 3450423804568229682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1313473223) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 72970726 + ... + 72970743.

Almost surely, 2^1313473221 is an apocalyptic number.

It is an amenable number.

1313473221 is a deficient number, since it is larger than the sum of its proper divisors (583765889).

1313473221 is a wasteful number, since it uses less digits than its factorization.

1313473221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145941475 (or 145941472 counting only the distinct ones).

The product of its digits is 3024, while the sum is 27.

The square root of 1313473221 is about 36241.8711023589. The cubic root of 1313473221 is about 1095.1503365240.

The spelling of 1313473221 in words is "one billion, three hundred thirteen million, four hundred seventy-three thousand, two hundred twenty-one".