31641161 has 4 divisors (see below), whose sum is σ = 31890432. Its totient is φ = 31391892.

The previous prime is 31641157. The next prime is 31641187. The reversal of 31641161 is 16114613.

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, and also an emirpimes, since its reverse is a distinct semiprime: 16114613 = 601 ⋅26813.

It is a cyclic number.

It is not a de Polignac number, because 31641161 - 2² = 31641157 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31641101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124445 + ... + 124698.

It is an arithmetic number, because the mean of its divisors is an integer number (7972608).

Almost surely, 2^31641161 is an apocalyptic number.

It is an amenable number.

31641161 is a deficient number, since it is larger than the sum of its proper divisors (249271).

31641161 is a wasteful number, since it uses less digits than its factorization.

31641161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249270.

The product of its digits is 432, while the sum is 23.

The square root of 31641161 is about 5625.0476442427. The cubic root of 31641161 is about 316.2890354728.

Adding to 31641161 its reverse (16114613), we get a palindrome (47755774).

The spelling of 31641161 in words is "thirty-one million, six hundred forty-one thousand, one hundred sixty-one".