36640991 has 2 divisors, whose sum is σ = 36640992. Its totient is φ = 36640990.

The previous prime is 36640979. The next prime is 36641021. The reversal of 36640991 is 19904663.

It is a weak prime.

It is an emirp because it is prime and its reverse (19904663) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 36640991 - 2¹⁴ = 36624607 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (36640091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18320495 + 18320496.

It is an arithmetic number, because the mean of its divisors is an integer number (18320496).

Almost surely, 2^36640991 is an apocalyptic number.

36640991 is a deficient number, since it is larger than the sum of its proper divisors (1).

36640991 is an equidigital number, since it uses as much as digits as its factorization.

36640991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34992, while the sum is 38.

The square root of 36640991 is about 6053.1802385193. The cubic root of 36640991 is about 332.1409348660.

The spelling of 36640991 in words is "thirty-six million, six hundred forty thousand, nine hundred ninety-one".