20151161 has 4 divisors (see below), whose sum is σ = 20187024. Its totient is φ = 20115300.

The previous prime is 20151127. The next prime is 20151169. The reversal of 20151161 is 16115102.

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 a cyclic number.

It is not a de Polignac number, because 20151161 - 2⁶ = 20151097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20151169) 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, 17075 + ... + 18216.

It is an arithmetic number, because the mean of its divisors is an integer number (5046756).

Almost surely, 2^20151161 is an apocalyptic number.

It is an amenable number.

20151161 is a deficient number, since it is larger than the sum of its proper divisors (35863).

20151161 is an equidigital number, since it uses as much as digits as its factorization.

20151161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35862.

The product of its (nonzero) digits is 60, while the sum is 17.

The square root of 20151161 is about 4489.0044553331. The cubic root of 20151161 is about 272.1239027850.

Adding to 20151161 its reverse (16115102), we get a palindrome (36266263).

The spelling of 20151161 in words is "twenty million, one hundred fifty-one thousand, one hundred sixty-one".