161338559 has 4 divisors (see below), whose sum is σ = 162846504. Its totient is φ = 159830616.

The previous prime is 161338547. The next prime is 161338561. The reversal of 161338559 is 955833161.

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

It is a cyclic number.

It is not a de Polignac number, because 161338559 - 2¹² = 161334463 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 (161338259) 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, 753812 + ... + 754025.

It is an arithmetic number, because the mean of its divisors is an integer number (40711626).

Almost surely, 2^161338559 is an apocalyptic number.

161338559 is a deficient number, since it is larger than the sum of its proper divisors (1507945).

161338559 is a wasteful number, since it uses less digits than its factorization.

161338559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1507944.

The product of its digits is 97200, while the sum is 41.

The square root of 161338559 is about 12701.9116277826. The cubic root of 161338559 is about 544.3932410714.

The spelling of 161338559 in words is "one hundred sixty-one million, three hundred thirty-eight thousand, five hundred fifty-nine".