16161501 has 4 divisors (see below), whose sum is σ = 21548672. Its totient is φ = 10774332.

The previous prime is 16161499. The next prime is 16161521. The reversal of 16161501 is 10516161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 16161501 - 2¹ = 16161499 is a prime.

It is a super-2 number, since 2×16161501² = 522388229146002, 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 (16161521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2693581 + ... + 2693586.

It is an arithmetic number, because the mean of its divisors is an integer number (5387168).

Almost surely, 2^16161501 is an apocalyptic number.

It is an amenable number.

16161501 is a deficient number, since it is larger than the sum of its proper divisors (5387171).

16161501 is an equidigital number, since it uses as much as digits as its factorization.

16161501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5387170.

The product of its (nonzero) digits is 180, while the sum is 21.

The square root of 16161501 is about 4020.1369379662. The cubic root of 16161501 is about 252.8292003887.

Adding to 16161501 its reverse (10516161), we get a palindrome (26677662).

The spelling of 16161501 in words is "sixteen million, one hundred sixty-one thousand, five hundred one".