161711399 has 2 divisors, whose sum is σ = 161711400. Its totient is φ = 161711398.

The previous prime is 161711393. The next prime is 161711411. The reversal of 161711399 is 993117161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161711399 - 2⁴ = 161711383 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161711393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80855699 + 80855700.

It is an arithmetic number, because the mean of its divisors is an integer number (80855700).

Almost surely, 2^161711399 is an apocalyptic number.

161711399 is a deficient number, since it is larger than the sum of its proper divisors (1).

161711399 is an equidigital number, since it uses as much as digits as its factorization.

161711399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10206, while the sum is 38.

The square root of 161711399 is about 12716.5796895234. The cubic root of 161711399 is about 544.8122676358.

The spelling of 161711399 in words is "one hundred sixty-one million, seven hundred eleven thousand, three hundred ninety-nine".