161145501 has 16 divisors (see below), whose sum is σ = 236336448. Its totient is φ = 97661520.

The previous prime is 161145497. The next prime is 161145617. The reversal of 161145501 is 105541161.

It is not a de Polignac number, because 161145501 - 2² = 161145497 is a prime.

It is a hoax number, since the sum of its digits (24) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161145301) 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, 16186 + ... + 24171.

It is an arithmetic number, because the mean of its divisors is an integer number (14771028).

Almost surely, 2^161145501 is an apocalyptic number.

161145501 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

161145501 is a deficient number, since it is larger than the sum of its proper divisors (75190947).

161145501 is an equidigital number, since it uses as much as digits as its factorization.

161145501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40393 (or 40371 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 24.

The square root of 161145501 is about 12694.3097882476. The cubic root of 161145501 is about 544.1760137708.

Adding to 161145501 its reverse (105541161), we get a palindrome (266686662).

The spelling of 161145501 in words is "one hundred sixty-one million, one hundred forty-five thousand, five hundred one".