31995421 has 8 divisors (see below), whose sum is σ = 32495904. Its totient is φ = 31497840.

The previous prime is 31995367. The next prime is 31995443. The reversal of 31995421 is 12459913.

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 31995421 - 2¹¹ = 31993373 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 (31995451) 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 7 ways as a sum of consecutive naturals, for example, 32466 + ... + 33436.

It is an arithmetic number, because the mean of its divisors is an integer number (4061988).

Almost surely, 2^31995421 is an apocalyptic number.

It is an amenable number.

31995421 is a deficient number, since it is larger than the sum of its proper divisors (500483).

31995421 is an equidigital number, since it uses as much as digits as its factorization.

31995421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1451.

The product of its digits is 9720, while the sum is 34.

The square root of 31995421 is about 5656.4495047689. The cubic root of 31995421 is about 317.4650665267.

The spelling of 31995421 in words is "thirty-one million, nine hundred ninety-five thousand, four hundred twenty-one".