30992231 has 2 divisors, whose sum is σ = 30992232. Its totient is φ = 30992230.

The previous prime is 30992189. The next prime is 30992243. The reversal of 30992231 is 13229903.

It is a strong prime.

It is an emirp because it is prime and its reverse (13229903) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30992231 is a prime.

It is a super-2 number, since 2×30992231² = 1921036764714722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 30992194 and 30992203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30992251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15496115 + 15496116.

It is an arithmetic number, because the mean of its divisors is an integer number (15496116).

Almost surely, 2^30992231 is an apocalyptic number.

30992231 is a deficient number, since it is larger than the sum of its proper divisors (1).

30992231 is an equidigital number, since it uses as much as digits as its factorization.

30992231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 30992231 is about 5567.0666423171. The cubic root of 30992231 is about 314.1118206958. Note that the first 3 decimals are identical.

The spelling of 30992231 in words is "thirty million, nine hundred ninety-two thousand, two hundred thirty-one".