1312000621 has 2 divisors, whose sum is σ = 1312000622. Its totient is φ = 1312000620.

The previous prime is 1312000607. The next prime is 1312000643. The reversal of 1312000621 is 1260002131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 941630596 + 370370025 = 30686^2 + 19245^2 .

It is a cyclic number.

It is not a de Polignac number, because 1312000621 - 2⁷ = 1312000493 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1312000595 and 1312000604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1312000601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656000310 + 656000311.

It is an arithmetic number, because the mean of its divisors is an integer number (656000311).

Almost surely, 2^1312000621 is an apocalyptic number.

It is an amenable number.

1312000621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312000621 is an equidigital number, since it uses as much as digits as its factorization.

1312000621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1312000621 is about 36221.5491247959. The cubic root of 1312000621 is about 1094.7409076817.

Adding to 1312000621 its reverse (1260002131), we get a palindrome (2572002752).

The spelling of 1312000621 in words is "one billion, three hundred twelve million, six hundred twenty-one", and thus it is an aban number.