31040641 has 4 divisors (see below), whose sum is σ = 32041984. Its totient is φ = 30039300.

The previous prime is 31040629. The next prime is 31040651. The reversal of 31040641 is 14604013.

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: 14604013 = 199 ⋅73387.

It is a cyclic number.

It is not a de Polignac number, because 31040641 - 2¹¹ = 31038593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31040651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 500625 + ... + 500686.

It is an arithmetic number, because the mean of its divisors is an integer number (8010496).

Almost surely, 2^31040641 is an apocalyptic number.

31040641 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

31040641 is a deficient number, since it is larger than the sum of its proper divisors (1001343).

31040641 is a wasteful number, since it uses less digits than its factorization.

31040641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1001342.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 31040641 is about 5571.4128369741. The cubic root of 31040641 is about 314.2752836267.

Adding to 31040641 its reverse (14604013), we get a palindrome (45644654).

The spelling of 31040641 in words is "thirty-one million, forty thousand, six hundred forty-one".