36491813 has 2 divisors, whose sum is σ = 36491814. Its totient is φ = 36491812.

The previous prime is 36491803. The next prime is 36491891. The reversal of 36491813 is 31819463.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31730689 + 4761124 = 5633^2 + 2182^2 .

It is a cyclic number.

It is not a de Polignac number, because 36491813 - 2⁴ = 36491797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (36491803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18245906 + 18245907.

It is an arithmetic number, because the mean of its divisors is an integer number (18245907).

Almost surely, 2^36491813 is an apocalyptic number.

It is an amenable number.

36491813 is a deficient number, since it is larger than the sum of its proper divisors (1).

36491813 is an equidigital number, since it uses as much as digits as its factorization.

36491813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 35.

The square root of 36491813 is about 6040.8453878576. The cubic root of 36491813 is about 331.6895686595.

The spelling of 36491813 in words is "thirty-six million, four hundred ninety-one thousand, eight hundred thirteen".