163987453 has 4 divisors (see below), whose sum is σ = 187414240. Its totient is φ = 140560668.

The previous prime is 163987409. The next prime is 163987469. The reversal of 163987453 is 354789361.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 354789361 = 59 ⋅6013379.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-163987453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163987553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11713383 + ... + 11713396.

It is an arithmetic number, because the mean of its divisors is an integer number (46853560).

Almost surely, 2^163987453 is an apocalyptic number.

It is an amenable number.

163987453 is a deficient number, since it is larger than the sum of its proper divisors (23426787).

163987453 is an equidigital number, since it uses as much as digits as its factorization.

163987453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23426786.

The product of its digits is 544320, while the sum is 46.

The square root of 163987453 is about 12805.7585874481. The cubic root of 163987453 is about 547.3564080669.

The spelling of 163987453 in words is "one hundred sixty-three million, nine hundred eighty-seven thousand, four hundred fifty-three".