36609581 has 2 divisors, whose sum is σ = 36609582. Its totient is φ = 36609580.

The previous prime is 36609563. The next prime is 36609589. The reversal of 36609581 is 18590663.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36421225 + 188356 = 6035^2 + 434^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-36609581 is a prime.

It is a super-2 number, since 2×36609581² = 2680522841991122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (36609589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18304790 + 18304791.

It is an arithmetic number, because the mean of its divisors is an integer number (18304791).

Almost surely, 2^36609581 is an apocalyptic number.

It is an amenable number.

36609581 is a deficient number, since it is larger than the sum of its proper divisors (1).

36609581 is an equidigital number, since it uses as much as digits as its factorization.

36609581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 36609581 is about 6050.5851783113. The cubic root of 36609581 is about 332.0459999406.

The spelling of 36609581 in words is "thirty-six million, six hundred nine thousand, five hundred eighty-one".