161731327 has 2 divisors, whose sum is σ = 161731328. Its totient is φ = 161731326.

The previous prime is 161731307. The next prime is 161731357. The reversal of 161731327 is 723137161.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161731327 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161731307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80865663 + 80865664.

It is an arithmetic number, because the mean of its divisors is an integer number (80865664).

Almost surely, 2^161731327 is an apocalyptic number.

161731327 is a deficient number, since it is larger than the sum of its proper divisors (1).

161731327 is an equidigital number, since it uses as much as digits as its factorization.

161731327 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5292, while the sum is 31.

The square root of 161731327 is about 12717.3632094078. The cubic root of 161731327 is about 544.8346461302.

Adding to 161731327 its reverse (723137161), we get a palindrome (884868488).

The spelling of 161731327 in words is "one hundred sixty-one million, seven hundred thirty-one thousand, three hundred twenty-seven".