161667983 has 2 divisors, whose sum is σ = 161667984. Its totient is φ = 161667982.

The previous prime is 161667971. The next prime is 161667991. The reversal of 161667983 is 389766161.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (389766161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161667983 - 2¹⁰ = 161666959 is a prime.

It is a super-2 number, since 2×161667983² = 52273073454576578, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161666983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80833991 + 80833992.

It is an arithmetic number, because the mean of its divisors is an integer number (80833992).

Almost surely, 2^161667983 is an apocalyptic number.

161667983 is a deficient number, since it is larger than the sum of its proper divisors (1).

161667983 is an equidigital number, since it uses as much as digits as its factorization.

161667983 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 47.

The square root of 161667983 is about 12714.8725121410. The cubic root of 161667983 is about 544.7635065163.

The spelling of 161667983 in words is "one hundred sixty-one million, six hundred sixty-seven thousand, nine hundred eighty-three".