327661531 has 2 divisors, whose sum is σ = 327661532. Its totient is φ = 327661530.

The previous prime is 327661447. The next prime is 327661547. The reversal of 327661531 is 135166723.

It is a strong prime.

It is an emirp because it is prime and its reverse (135166723) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 327661531 - 2¹⁹ = 327137243 is a prime.

It is a super-2 number, since 2×327661531² = 214724157794527922, which contains 22 as substring.

It is equal to p_17666170 and since 327661531 and 17666170 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (327661331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 163830765 + 163830766.

It is an arithmetic number, because the mean of its divisors is an integer number (163830766).

Almost surely, 2^327661531 is an apocalyptic number.

327661531 is a deficient number, since it is larger than the sum of its proper divisors (1).

327661531 is an equidigital number, since it uses as much as digits as its factorization.

327661531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22680, while the sum is 34.

The square root of 327661531 is about 18101.4234523145. The cubic root of 327661531 is about 689.4061480101.

The spelling of 327661531 in words is "three hundred twenty-seven million, six hundred sixty-one thousand, five hundred thirty-one".