36538991 has 2 divisors, whose sum is σ = 36538992. Its totient is φ = 36538990.

The previous prime is 36538981. The next prime is 36538993. The reversal of 36538991 is 19983563.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 36538991 - 2¹⁰ = 36537967 is a prime.

Together with 36538993, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (36538993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18269495 + 18269496.

It is an arithmetic number, because the mean of its divisors is an integer number (18269496).

Almost surely, 2^36538991 is an apocalyptic number.

36538991 is a deficient number, since it is larger than the sum of its proper divisors (1).

36538991 is an equidigital number, since it uses as much as digits as its factorization.

36538991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 174960, while the sum is 44.

The square root of 36538991 is about 6044.7490435915. The cubic root of 36538991 is about 331.8324473893.

The spelling of 36538991 in words is "thirty-six million, five hundred thirty-eight thousand, nine hundred ninety-one".