31604101 has 4 divisors (see below), whose sum is σ = 32075872. Its totient is φ = 31132332.

The previous prime is 31604099. The next prime is 31604129. The reversal of 31604101 is 10140613.

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: 10140613 = 7 ⋅1448659.

It is a cyclic number.

It is not a de Polignac number, because 31604101 - 2¹ = 31604099 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31604191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 235785 + ... + 235918.

It is an arithmetic number, because the mean of its divisors is an integer number (8018968).

Almost surely, 2^31604101 is an apocalyptic number.

It is an amenable number.

31604101 is a deficient number, since it is larger than the sum of its proper divisors (471771).

31604101 is an equidigital number, since it uses as much as digits as its factorization.

31604101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471770.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 31604101 is about 5621.7524847684. The cubic root of 31604101 is about 316.1655017524.

Adding to 31604101 its reverse (10140613), we get a palindrome (41744714).

The spelling of 31604101 in words is "thirty-one million, six hundred four thousand, one hundred one".