31672471 has 4 divisors (see below), whose sum is σ = 31684744. Its totient is φ = 31660200.

The previous prime is 31672469. The next prime is 31672493. The reversal of 31672471 is 17427613.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 17427613 = 7 ⋅2489659.

It is a cyclic number.

It is not a de Polignac number, because 31672471 - 2¹ = 31672469 is a prime.

It is a super-3 number, since 3×31672471³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31672171) 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, 600 + ... + 7981.

It is an arithmetic number, because the mean of its divisors is an integer number (7921186).

Almost surely, 2^31672471 is an apocalyptic number.

31672471 is a deficient number, since it is larger than the sum of its proper divisors (12273).

31672471 is an equidigital number, since it uses as much as digits as its factorization.

31672471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12272.

The product of its digits is 7056, while the sum is 31.

The square root of 31672471 is about 5627.8300436314. The cubic root of 31672471 is about 316.3933273163.

The spelling of 31672471 in words is "thirty-one million, six hundred seventy-two thousand, four hundred seventy-one".