161733421 has 8 divisors (see below), whose sum is σ = 164200824. Its totient is φ = 159283200.

The previous prime is 161733419. The next prime is 161733463. The reversal of 161733421 is 124337161.

It can be written as a sum of positive squares in 4 ways, for example, as 99102025 + 62631396 = 9955^2 + 7914^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161733421 - 2¹ = 161733419 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161733421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161730421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15345 + ... + 23641.

It is an arithmetic number, because the mean of its divisors is an integer number (20525103).

Almost surely, 2^161733421 is an apocalyptic number.

It is an amenable number.

161733421 is a deficient number, since it is larger than the sum of its proper divisors (2467403).

161733421 is a wasteful number, since it uses less digits than its factorization.

161733421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8591.

The product of its digits is 3024, while the sum is 28.

The square root of 161733421 is about 12717.4455375284. The cubic root of 161733421 is about 544.8369975173.

The spelling of 161733421 in words is "one hundred sixty-one million, seven hundred thirty-three thousand, four hundred twenty-one".