31161361 has 8 divisors (see below), whose sum is σ = 38850624. Its totient is φ = 24281520.

The previous prime is 31161331. The next prime is 31161367. The reversal of 31161361 is 16316113.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31161361 - 2⁹ = 31160849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31161367) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 202270 + ... + 202423.

It is an arithmetic number, because the mean of its divisors is an integer number (4856328).

Almost surely, 2^31161361 is an apocalyptic number.

It is an amenable number.

31161361 is a deficient number, since it is larger than the sum of its proper divisors (7689263).

31161361 is a wasteful number, since it uses less digits than its factorization.

31161361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404711.

The product of its digits is 324, while the sum is 22.

The square root of 31161361 is about 5582.2362006637. The cubic root of 31161361 is about 314.6821720780.

Adding to 31161361 its reverse (16316113), we get a palindrome (47477474).

The spelling of 31161361 in words is "thirty-one million, one hundred sixty-one thousand, three hundred sixty-one".