161535493 has 8 divisors (see below), whose sum is σ = 186306560. Its totient is φ = 137188080.

The previous prime is 161535443. The next prime is 161535497. The reversal of 161535493 is 394535161.

It is a happy number.

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 161535493 - 2⁹ = 161534981 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 (161535497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105093 + ... + 106618.

It is an arithmetic number, because the mean of its divisors is an integer number (23288320).

Almost surely, 2^161535493 is an apocalyptic number.

It is an amenable number.

161535493 is a deficient number, since it is larger than the sum of its proper divisors (24771067).

161535493 is a wasteful number, since it uses less digits than its factorization.

161535493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211827.

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

The square root of 161535493 is about 12709.6614038298. The cubic root of 161535493 is about 544.6146511460.

The spelling of 161535493 in words is "one hundred sixty-one million, five hundred thirty-five thousand, four hundred ninety-three".