36991817 has 2 divisors, whose sum is σ = 36991818. Its totient is φ = 36991816.

The previous prime is 36991811. The next prime is 36991819. The reversal of 36991817 is 71819963.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31091776 + 5900041 = 5576^2 + 2429^2 .

It is a cyclic number.

It is not a de Polignac number, because 36991817 - 2⁶ = 36991753 is a prime.

It is a super-2 number, since 2×36991817² = 2736789049922978, which contains 22 as substring.

Together with 36991819, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (36991811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18495908 + 18495909.

It is an arithmetic number, because the mean of its divisors is an integer number (18495909).

Almost surely, 2^36991817 is an apocalyptic number.

It is an amenable number.

36991817 is a deficient number, since it is larger than the sum of its proper divisors (1).

36991817 is an equidigital number, since it uses as much as digits as its factorization.

36991817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 44.

The square root of 36991817 is about 6082.0898546470. The cubic root of 36991817 is about 333.1976179737.

The spelling of 36991817 in words is "thirty-six million, nine hundred ninety-one thousand, eight hundred seventeen".