161040133 has 16 divisors (see below), whose sum is σ = 176670720. Its totient is φ = 146131200.

The previous prime is 161040127. The next prime is 161040149. The reversal of 161040133 is 331040161.

It is a cyclic number.

It is not a de Polignac number, because 161040133 - 2²¹ = 158942981 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 161040133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161040193) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 226783 + ... + 227491.

It is an arithmetic number, because the mean of its divisors is an integer number (11041920).

Almost surely, 2^161040133 is an apocalyptic number.

161040133 is the 7327-th octagonal number.

It is an amenable number.

161040133 is a deficient number, since it is larger than the sum of its proper divisors (15630587).

161040133 is a wasteful number, since it uses less digits than its factorization.

161040133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1188.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 161040133 is about 12690.1589036544. The cubic root of 161040133 is about 544.0573813553.

Adding to 161040133 its reverse (331040161), we get a palindrome (492080294).

The spelling of 161040133 in words is "one hundred sixty-one million, forty thousand, one hundred thirty-three".