31421071 has 4 divisors (see below), whose sum is σ = 34277544. Its totient is φ = 28564600.

The previous prime is 31421069. The next prime is 31421081. The reversal of 31421071 is 17012413.

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

It is a cyclic number.

It is not a de Polignac number, because 31421071 - 2¹ = 31421069 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 (31421081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1428220 + ... + 1428241.

It is an arithmetic number, because the mean of its divisors is an integer number (8569386).

Almost surely, 2^31421071 is an apocalyptic number.

31421071 is a deficient number, since it is larger than the sum of its proper divisors (2856473).

31421071 is a wasteful number, since it uses less digits than its factorization.

31421071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2856472.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 31421071 is about 5605.4501157356. The cubic root of 31421071 is about 315.5539793934.

Adding to 31421071 its reverse (17012413), we get a palindrome (48433484).

The spelling of 31421071 in words is "thirty-one million, four hundred twenty-one thousand, seventy-one".