31798321 has 3 divisors (see below), whose sum is σ = 31803961. Its totient is φ = 31792682.

The previous prime is 31798307. The next prime is 31798331. The reversal of 31798321 is 12389713.

The square root of 31798321 is 5639.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 31798321 - 2¹⁷ = 31667249 is a prime.

It is a super-2 number, since 2×31798321² = 2022266436838082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31798301) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2820 + ... + 8458.

Almost surely, 2^31798321 is an apocalyptic number.

31798321 is the 5639-th square number.

31798321 is the 2820-th centered octagonal number.

It is an amenable number.

31798321 is a deficient number, since it is larger than the sum of its proper divisors (5640).

31798321 is an frugal number, since it uses more digits than its factorization.

31798321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11278 (or 5639 counting only the distinct ones).

The product of its digits is 9072, while the sum is 34.

The cubic root of 31798321 is about 316.8118345800.

The spelling of 31798321 in words is "thirty-one million, seven hundred ninety-eight thousand, three hundred twenty-one".