11721501829 has 2 divisors, whose sum is σ = 11721501830. Its totient is φ = 11721501828.

The previous prime is 11721501823. The next prime is 11721501871. The reversal of 11721501829 is 92810512711.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10780668900 + 940832929 = 103830^2 + 30673^2 .

It is a cyclic number.

It is not a de Polignac number, because 11721501829 - 2¹⁷ = 11721370757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11721501823) 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, 5860750914 + 5860750915.

It is an arithmetic number, because the mean of its divisors is an integer number (5860750915).

Almost surely, 2^11721501829 is an apocalyptic number.

It is an amenable number.

11721501829 is a deficient number, since it is larger than the sum of its proper divisors (1).

11721501829 is an equidigital number, since it uses as much as digits as its factorization.

11721501829 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 37.

The spelling of 11721501829 in words is "eleven billion, seven hundred twenty-one million, five hundred one thousand, eight hundred twenty-nine".