31243641 has 32 divisors (see below), whose sum is σ = 49717248. Its totient is φ = 17202240.

The previous prime is 31243633. The next prime is 31243721. The reversal of 31243641 is 14634213.

It is not a de Polignac number, because 31243641 - 2³ = 31243633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31243601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28200 + ... + 29286.

It is an arithmetic number, because the mean of its divisors is an integer number (1553664).

Almost surely, 2^31243641 is an apocalyptic number.

It is an amenable number.

31243641 is a deficient number, since it is larger than the sum of its proper divisors (18473607).

31243641 is a wasteful number, since it uses less digits than its factorization.

31243641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1181.

The product of its digits is 1728, while the sum is 24.

The square root of 31243641 is about 5589.6011485615. The cubic root of 31243641 is about 314.9588961232.

Adding to 31243641 its reverse (14634213), we get a palindrome (45877854).

The spelling of 31243641 in words is "thirty-one million, two hundred forty-three thousand, six hundred forty-one".