161530501 has 16 divisors (see below), whose sum is σ = 181827648. Its totient is φ = 142243200.

The previous prime is 161530483. The next prime is 161530519. The reversal of 161530501 is 105035161.

It is an interprime number because it is at equal distance from previous prime (161530483) and next prime (161530519).

It is not a de Polignac number, because 161530501 - 2²³ = 153141893 is a prime.

It is a super-2 number, since 2×161530501² = 52184205506622002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161534501) 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, 43161 + ... + 46753.

It is an arithmetic number, because the mean of its divisors is an integer number (11364228).

Almost surely, 2^161530501 is an apocalyptic number.

161530501 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

161530501 is a deficient number, since it is larger than the sum of its proper divisors (20297147).

161530501 is a wasteful number, since it uses less digits than its factorization.

161530501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3732.

The product of its (nonzero) digits is 450, while the sum is 22.

The square root of 161530501 is about 12709.4650162782. The cubic root of 161530501 is about 544.6090409356.

Adding to 161530501 its reverse (105035161), we get a palindrome (266565662).

The spelling of 161530501 in words is "one hundred sixty-one million, five hundred thirty thousand, five hundred one".