2089691521 has 2 divisors, whose sum is σ = 2089691522. Its totient is φ = 2089691520.

The previous prime is 2089691491. The next prime is 2089691531. The reversal of 2089691521 is 1251969802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1919754225 + 169937296 = 43815^2 + 13036^2 .

It is a cyclic number.

It is not a de Polignac number, because 2089691521 - 2¹⁹ = 2089167233 is a prime.

It is not a weakly prime, because it can be changed into another prime (2089691531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1044845760 + 1044845761.

It is an arithmetic number, because the mean of its divisors is an integer number (1044845761).

Almost surely, 2^2089691521 is an apocalyptic number.

It is an amenable number.

2089691521 is a deficient number, since it is larger than the sum of its proper divisors (1).

2089691521 is an equidigital number, since it uses as much as digits as its factorization.

2089691521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 2089691521 is about 45713.1438538195. The cubic root of 2089691521 is about 1278.4803582264.

The spelling of 2089691521 in words is "two billion, eighty-nine million, six hundred ninety-one thousand, five hundred twenty-one".