31828081 has 8 divisors (see below), whose sum is σ = 32608800. Its totient is φ = 31055520.

The previous prime is 31828061. The next prime is 31828087. The reversal of 31828081 is 18082813.

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 31828081 - 2⁷ = 31827953 is a prime.

It is a super-2 number, since 2×31828081² = 2026053480285122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31828087) 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 7 ways as a sum of consecutive naturals, for example, 6261 + ... + 10141.

It is an arithmetic number, because the mean of its divisors is an integer number (4076100).

It is a vampire number, since it can be written as 3881 ⋅ 8201 (with its own digits).

Almost surely, 2^31828081 is an apocalyptic number.

It is an amenable number.

31828081 is a deficient number, since it is larger than the sum of its proper divisors (780719).

31828081 is a wasteful number, since it uses less digits than its factorization.

31828081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4079.

The product of its (nonzero) digits is 3072, while the sum is 31.

The square root of 31828081 is about 5641.6381486231. The cubic root of 31828081 is about 316.9106383335.

The spelling of 31828081 in words is "thirty-one million, eight hundred twenty-eight thousand, eighty-one".