1373890621 has 2 divisors, whose sum is σ = 1373890622. Its totient is φ = 1373890620.

The previous prime is 1373890619. The next prime is 1373890657. The reversal of 1373890621 is 1260983731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 766514596 + 607376025 = 27686^2 + 24645^2 .

It is a cyclic number.

It is not a de Polignac number, because 1373890621 - 2¹ = 1373890619 is a prime.

Together with 1373890619, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1373890691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 686945310 + 686945311.

It is an arithmetic number, because the mean of its divisors is an integer number (686945311).

Almost surely, 2^1373890621 is an apocalyptic number.

It is an amenable number.

1373890621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1373890621 is an equidigital number, since it uses as much as digits as its factorization.

1373890621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 1373890621 is about 37066.0305535945. The cubic root of 1373890621 is about 1111.6909058124.

The spelling of 1373890621 in words is "one billion, three hundred seventy-three million, eight hundred ninety thousand, six hundred twenty-one".