161004493 has 8 divisors (see below), whose sum is σ = 175765688. Its totient is φ = 146582784.

The previous prime is 161004463. The next prime is 161004497. The reversal of 161004493 is 394400161.

It can be written as a sum of positive squares in 4 ways, for example, as 10156969 + 150847524 = 3187^2 + 12282^2 .

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 161004493 - 2¹³ = 160996301 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 (161004497) 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, 83880 + ... + 85777.

It is an arithmetic number, because the mean of its divisors is an integer number (21970711).

Almost surely, 2^161004493 is an apocalyptic number.

161004493 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

161004493 is a deficient number, since it is larger than the sum of its proper divisors (14761195).

161004493 is a wasteful number, since it uses less digits than its factorization.

161004493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169743.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 161004493 is about 12688.7545882171. The cubic root of 161004493 is about 544.0172430467.

The spelling of 161004493 in words is "one hundred sixty-one million, four thousand, four hundred ninety-three".