36209721593 has 2 divisors, whose sum is σ = 36209721594. Its totient is φ = 36209721592.

The previous prime is 36209721571. The next prime is 36209721617. The reversal of 36209721593 is 39512790263.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25076939449 + 11132782144 = 158357^2 + 105512^2 .

It is a cyclic number.

It is not a de Polignac number, because 36209721593 - 2¹⁴ = 36209705209 is a prime.

It is a super-2 number, since 2×36209721593² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (36209721503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18104860796 + 18104860797.

It is an arithmetic number, because the mean of its divisors is an integer number (18104860797).

Almost surely, 2^36209721593 is an apocalyptic number.

It is an amenable number.

36209721593 is a deficient number, since it is larger than the sum of its proper divisors (1).

36209721593 is an equidigital number, since it uses as much as digits as its factorization.

36209721593 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 612360, while the sum is 47.

The spelling of 36209721593 in words is "thirty-six billion, two hundred nine million, seven hundred twenty-one thousand, five hundred ninety-three".