161667937 has 2 divisors, whose sum is σ = 161667938. Its totient is φ = 161667936.

The previous prime is 161667907. The next prime is 161667949. The reversal of 161667937 is 739766161.

161667937 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 146991376 + 14676561 = 12124^2 + 3831^2 .

It is a cyclic number.

It is not a de Polignac number, because 161667937 - 2¹⁵ = 161635169 is a prime.

It is a super-2 number, since 2×161667937² = 52273043707671938, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161667907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80833968 + 80833969.

It is an arithmetic number, because the mean of its divisors is an integer number (80833969).

Almost surely, 2^161667937 is an apocalyptic number.

It is an amenable number.

161667937 is a deficient number, since it is larger than the sum of its proper divisors (1).

161667937 is an equidigital number, since it uses as much as digits as its factorization.

161667937 is an evil number, because the sum of its binary digits is even.

The product of its digits is 285768, while the sum is 46.

The square root of 161667937 is about 12714.8707032356. The cubic root of 161667937 is about 544.7634548485.

The spelling of 161667937 in words is "one hundred sixty-one million, six hundred sixty-seven thousand, nine hundred thirty-seven".