36604991 has 2 divisors, whose sum is σ = 36604992. Its totient is φ = 36604990.

The previous prime is 36604969. The next prime is 36604993. The reversal of 36604991 is 19940663.

It is a strong prime.

It is an emirp because it is prime and its reverse (19940663) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 36604991 - 2¹⁸ = 36342847 is a prime.

It is a super-2 number, since 2×36604991² = 2679850732220162, which contains 22 as substring.

Together with 36604993, 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 (36604993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18302495 + 18302496.

It is an arithmetic number, because the mean of its divisors is an integer number (18302496).

Almost surely, 2^36604991 is an apocalyptic number.

36604991 is a deficient number, since it is larger than the sum of its proper divisors (1).

36604991 is an equidigital number, since it uses as much as digits as its factorization.

36604991 is an evil number, because the sum of its binary digits is even.

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

The square root of 36604991 is about 6050.2058642661. The cubic root of 36604991 is about 332.0321223818.

The spelling of 36604991 in words is "thirty-six million, six hundred four thousand, nine hundred ninety-one".