31163641 has 4 divisors (see below), whose sum is σ = 31409152. Its totient is φ = 30918132.

The previous prime is 31163633. The next prime is 31163663. The reversal of 31163641 is 14636113.

It is a happy number.

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: 14636113 = 347 ⋅42179.

It is a cyclic number.

It is not a de Polignac number, because 31163641 - 2³ = 31163633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31163611) 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, 122565 + ... + 122818.

It is an arithmetic number, because the mean of its divisors is an integer number (7852288).

Almost surely, 2^31163641 is an apocalyptic number.

It is an amenable number.

31163641 is a deficient number, since it is larger than the sum of its proper divisors (245511).

31163641 is a wasteful number, since it uses less digits than its factorization.

31163641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245510.

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

The square root of 31163641 is about 5582.4404161621. The cubic root of 31163641 is about 314.6898467305.

Adding to 31163641 its reverse (14636113), we get a palindrome (45799754).

The spelling of 31163641 in words is "thirty-one million, one hundred sixty-three thousand, six hundred forty-one".