163947541 has 4 divisors (see below), whose sum is σ = 173591532. Its totient is φ = 154303552.

The previous prime is 163947533. The next prime is 163947559. The reversal of 163947541 is 145749361.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 95140516 + 68807025 = 9754^2 + 8295^2 .

It is a cyclic number.

It is not a de Polignac number, because 163947541 - 2³ = 163947533 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 163947494 and 163947503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163947571) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4821970 + ... + 4822003.

It is an arithmetic number, because the mean of its divisors is an integer number (43397883).

Almost surely, 2^163947541 is an apocalyptic number.

It is an amenable number.

163947541 is a deficient number, since it is larger than the sum of its proper divisors (9643991).

163947541 is an equidigital number, since it uses as much as digits as its factorization.

163947541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9643990.

The product of its digits is 90720, while the sum is 40.

The square root of 163947541 is about 12804.2001312069. The cubic root of 163947541 is about 547.3119984467.

The spelling of 163947541 in words is "one hundred sixty-three million, nine hundred forty-seven thousand, five hundred forty-one".