31424981 has 8 divisors (see below), whose sum is σ = 36173760. Its totient is φ = 26741088.

The previous prime is 31424977. The next prime is 31424989. The reversal of 31424981 is 18942413.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 31424981 - 2² = 31424977 is a prime.

It is a super-2 number, since 2×31424981² = 1975058861700722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31424989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15176 + ... + 17121.

It is an arithmetic number, because the mean of its divisors is an integer number (4521720).

Almost surely, 2^31424981 is an apocalyptic number.

It is an amenable number.

31424981 is a deficient number, since it is larger than the sum of its proper divisors (4748779).

31424981 is a wasteful number, since it uses less digits than its factorization.

31424981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32443.

The product of its digits is 6912, while the sum is 32.

The square root of 31424981 is about 5605.7988725961. The cubic root of 31424981 is about 315.5670679022.

The spelling of 31424981 in words is "thirty-one million, four hundred twenty-four thousand, nine hundred eighty-one".