36391891 has 2 divisors, whose sum is σ = 36391892. Its totient is φ = 36391890.

The previous prime is 36391879. The next prime is 36391937. The reversal of 36391891 is 19819363.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 36391891 - 2⁹ = 36391379 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (36391811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18195945 + 18195946.

It is an arithmetic number, because the mean of its divisors is an integer number (18195946).

Almost surely, 2^36391891 is an apocalyptic number.

36391891 is a deficient number, since it is larger than the sum of its proper divisors (1).

36391891 is an equidigital number, since it uses as much as digits as its factorization.

36391891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34992, while the sum is 40.

The square root of 36391891 is about 6032.5691873364. The cubic root of 36391891 is about 331.3865474310.

The spelling of 36391891 in words is "thirty-six million, three hundred ninety-one thousand, eight hundred ninety-one".