163943551 has 2 divisors, whose sum is σ = 163943552. Its totient is φ = 163943550.

The previous prime is 163943537. The next prime is 163943557. The reversal of 163943551 is 155349361.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 163943551 - 2⁵ = 163943519 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 163943551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163943557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81971775 + 81971776.

It is an arithmetic number, because the mean of its divisors is an integer number (81971776).

Almost surely, 2^163943551 is an apocalyptic number.

163943551 is a deficient number, since it is larger than the sum of its proper divisors (1).

163943551 is an equidigital number, since it uses as much as digits as its factorization.

163943551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48600, while the sum is 37.

The square root of 163943551 is about 12804.0443220101. The cubic root of 163943551 is about 547.3075584236.

The spelling of 163943551 in words is "one hundred sixty-three million, nine hundred forty-three thousand, five hundred fifty-one".