36129991 has 4 divisors (see below), whose sum is σ = 36263584. Its totient is φ = 35996400.

The previous prime is 36129971. The next prime is 36130013. The reversal of 36129991 is 19992163.

36129991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19992163 = 1499 ⋅13337.

It is a cyclic number.

It is not a de Polignac number, because 36129991 - 2⁵ = 36129959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36129971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66390 + ... + 66931.

It is an arithmetic number, because the mean of its divisors is an integer number (9065896).

Almost surely, 2^36129991 is an apocalyptic number.

36129991 is a deficient number, since it is larger than the sum of its proper divisors (133593).

36129991 is a wasteful number, since it uses less digits than its factorization.

36129991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133592.

The product of its digits is 26244, while the sum is 40.

The square root of 36129991 is about 6010.8228222100. The cubic root of 36129991 is about 330.5896741857.

The spelling of 36129991 in words is "thirty-six million, one hundred twenty-nine thousand, nine hundred ninety-one".