31389641 has 8 divisors (see below), whose sum is σ = 33554304. Its totient is φ = 29291680.

The previous prime is 31389637. The next prime is 31389643. The reversal of 31389641 is 14698313.

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 31389641 - 2² = 31389637 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31389643) 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, 15701 + ... + 17586.

It is an arithmetic number, because the mean of its divisors is an integer number (4194288).

Almost surely, 2^31389641 is an apocalyptic number.

It is an amenable number.

31389641 is a deficient number, since it is larger than the sum of its proper divisors (2164663).

31389641 is a wasteful number, since it uses less digits than its factorization.

31389641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33351.

The product of its digits is 15552, while the sum is 35.

The square root of 31389641 is about 5602.6458927903. The cubic root of 31389641 is about 315.4487297421.

The spelling of 31389641 in words is "thirty-one million, three hundred eighty-nine thousand, six hundred forty-one".