31227981 has 8 divisors (see below), whose sum is σ = 41665344. Its totient is φ = 20804640.

The previous prime is 31227967. The next prime is 31228007. The reversal of 31227981 is 18972213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31227981 - 2⁵ = 31227949 is a prime.

It is a super-2 number, since 2×31227981² = 1950373594672722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31227481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3976 + ... + 8846.

It is an arithmetic number, because the mean of its divisors is an integer number (5208168).

Almost surely, 2^31227981 is an apocalyptic number.

It is an amenable number.

31227981 is a deficient number, since it is larger than the sum of its proper divisors (10437363).

31227981 is a wasteful number, since it uses less digits than its factorization.

31227981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7011.

The product of its digits is 6048, while the sum is 33.

The square root of 31227981 is about 5588.2001574747. The cubic root of 31227981 is about 314.9062658872.

The spelling of 31227981 in words is "thirty-one million, two hundred twenty-seven thousand, nine hundred eighty-one".