163971377 has 2 divisors, whose sum is σ = 163971378. Its totient is φ = 163971376.

The previous prime is 163971343. The next prime is 163971389. The reversal of 163971377 is 773179361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 106832896 + 57138481 = 10336^2 + 7559^2 .

It is a cyclic number.

It is not a de Polignac number, because 163971377 - 2²² = 159777073 is a prime.

It is a super-2 number, since 2×163971377² = 53773224950552258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (163971077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81985688 + 81985689.

It is an arithmetic number, because the mean of its divisors is an integer number (81985689).

Almost surely, 2^163971377 is an apocalyptic number.

It is an amenable number.

163971377 is a deficient number, since it is larger than the sum of its proper divisors (1).

163971377 is an equidigital number, since it uses as much as digits as its factorization.

163971377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 166698, while the sum is 44.

The square root of 163971377 is about 12805.1308857036. The cubic root of 163971377 is about 547.3385213546.

The spelling of 163971377 in words is "one hundred sixty-three million, nine hundred seventy-one thousand, three hundred seventy-seven".