31641361 has 4 divisors (see below), whose sum is σ = 31662772. Its totient is φ = 31619952.

The previous prime is 31641329. The next prime is 31641367. The reversal of 31641361 is 16314613.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2047761 + 29593600 = 1431^2 + 5440^2 .

It is a cyclic number.

It is not a de Polignac number, because 31641361 - 2⁵ = 31641329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31641367) 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, 8310 + ... + 11503.

It is an arithmetic number, because the mean of its divisors is an integer number (7915693).

Almost surely, 2^31641361 is an apocalyptic number.

It is an amenable number.

31641361 is a deficient number, since it is larger than the sum of its proper divisors (21411).

31641361 is a wasteful number, since it uses less digits than its factorization.

31641361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21410.

The product of its digits is 1296, while the sum is 25.

The square root of 31641361 is about 5625.0654218418. The cubic root of 31641361 is about 316.2897018798.

Adding to 31641361 its reverse (16314613), we get a palindrome (47955974).

The spelling of 31641361 in words is "thirty-one million, six hundred forty-one thousand, three hundred sixty-one".