163450691 has 2 divisors, whose sum is σ = 163450692. Its totient is φ = 163450690.

The previous prime is 163450687. The next prime is 163450717. The reversal of 163450691 is 196054361.

It is a weak prime.

It is an emirp because it is prime and its reverse (196054361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 163450691 - 2² = 163450687 is a prime.

It is a super-2 number, since 2×163450691² = 53432256776754962, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (163450891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81725345 + 81725346.

It is an arithmetic number, because the mean of its divisors is an integer number (81725346).

Almost surely, 2^163450691 is an apocalyptic number.

163450691 is a deficient number, since it is larger than the sum of its proper divisors (1).

163450691 is an equidigital number, since it uses as much as digits as its factorization.

163450691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 163450691 is about 12784.7835726695. The cubic root of 163450691 is about 546.7585548906.

It can be divided in two parts, 1634 and 50691, that added together give a palindrome (52325).

The spelling of 163450691 in words is "one hundred sixty-three million, four hundred fifty thousand, six hundred ninety-one".