1926689621 has 2 divisors, whose sum is σ = 1926689622. Its totient is φ = 1926689620.

The previous prime is 1926689603. The next prime is 1926689629. The reversal of 1926689621 is 1269866291.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1108157521 + 818532100 = 33289^2 + 28610^2 .

It is an emirp because it is prime and its reverse (1269866291) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1926689621 - 2²² = 1922495317 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1926689621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1926689629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 963344810 + 963344811.

It is an arithmetic number, because the mean of its divisors is an integer number (963344811).

Almost surely, 2^1926689621 is an apocalyptic number.

It is an amenable number.

1926689621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1926689621 is an equidigital number, since it uses as much as digits as its factorization.

1926689621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 559872, while the sum is 50.

The square root of 1926689621 is about 43894.0727319760. The cubic root of 1926689621 is about 1244.3348158189.

The spelling of 1926689621 in words is "one billion, nine hundred twenty-six million, six hundred eighty-nine thousand, six hundred twenty-one".