31671641 has 4 divisors (see below), whose sum is σ = 31921152. Its totient is φ = 31422132.

The previous prime is 31671623. The next prime is 31671643. The reversal of 31671641 is 14617613.

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: 14617613 = 61 ⋅239633.

It is a cyclic number.

It is not a de Polignac number, because 31671641 - 2²² = 27477337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31671643) 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, 124565 + ... + 124818.

It is an arithmetic number, because the mean of its divisors is an integer number (7980288).

Almost surely, 2^31671641 is an apocalyptic number.

It is an amenable number.

31671641 is a deficient number, since it is larger than the sum of its proper divisors (249511).

31671641 is a wasteful number, since it uses less digits than its factorization.

31671641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249510.

The product of its digits is 3024, while the sum is 29.

The square root of 31671641 is about 5627.7563024708. The cubic root of 31671641 is about 316.3905635202.

The spelling of 31671641 in words is "thirty-one million, six hundred seventy-one thousand, six hundred forty-one".