31898081 has 4 divisors (see below), whose sum is σ = 31916052. Its totient is φ = 31880112.

The previous prime is 31898071. The next prime is 31898089. The reversal of 31898081 is 18089813.

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 10182481 + 21715600 = 3191^2 + 4660^2 .

It is a cyclic number.

It is not a de Polignac number, because 31898081 - 2¹⁴ = 31881697 is a prime.

It is a super-2 number, since 2×31898081² = 2034975142965122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31898089) 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, 5990 + ... + 9983.

It is an arithmetic number, because the mean of its divisors is an integer number (7979013).

Almost surely, 2^31898081 is an apocalyptic number.

It is an amenable number.

31898081 is a deficient number, since it is larger than the sum of its proper divisors (17971).

31898081 is a wasteful number, since it uses less digits than its factorization.

31898081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17970.

The product of its (nonzero) digits is 13824, while the sum is 38.

The square root of 31898081 is about 5647.8386131333. The cubic root of 31898081 is about 317.1427970731.

The spelling of 31898081 in words is "thirty-one million, eight hundred ninety-eight thousand, eighty-one".