1312199621 has 16 divisors (see below), whose sum is σ = 1405470528. Its totient is φ = 1220793600.

The previous prime is 1312199591. The next prime is 1312199633. The reversal of 1312199621 is 1269912131.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1312199621 - 2⁶ = 1312199557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312199321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 651506 + ... + 653516.

It is an arithmetic number, because the mean of its divisors is an integer number (87841908).

Almost surely, 2^1312199621 is an apocalyptic number.

It is an amenable number.

1312199621 is a deficient number, since it is larger than the sum of its proper divisors (93270907).

1312199621 is a wasteful number, since it uses less digits than its factorization.

1312199621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2452.

The product of its digits is 5832, while the sum is 35.

The square root of 1312199621 is about 36224.2960042014. The cubic root of 1312199621 is about 1094.7962538006.

The spelling of 1312199621 in words is "one billion, three hundred twelve million, one hundred ninety-nine thousand, six hundred twenty-one".