31567421 has 4 divisors (see below), whose sum is σ = 31705500. Its totient is φ = 31429344.

The previous prime is 31567411. The next prime is 31567427. The reversal of 31567421 is 12476513.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 28504921 + 3062500 = 5339^2 + 1750^2 .

It is a cyclic number.

It is not a de Polignac number, because 31567421 - 2¹⁰ = 31566397 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 (31567427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68696 + ... + 69153.

It is an arithmetic number, because the mean of its divisors is an integer number (7926375).

Almost surely, 2^31567421 is an apocalyptic number.

It is an amenable number.

31567421 is a deficient number, since it is larger than the sum of its proper divisors (138079).

31567421 is a wasteful number, since it uses less digits than its factorization.

31567421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138078.

The product of its digits is 5040, while the sum is 29.

The square root of 31567421 is about 5618.4892097431. The cubic root of 31567421 is about 316.0431395732.

The spelling of 31567421 in words is "thirty-one million, five hundred sixty-seven thousand, four hundred twenty-one".