30869981 has 2 divisors, whose sum is σ = 30869982. Its totient is φ = 30869980.

The previous prime is 30869953. The next prime is 30869983. The reversal of 30869981 is 18996803.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16687225 + 14182756 = 4085^2 + 3766^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30869981 is a prime.

It is a super-2 number, since 2×30869981² = 1905911453880722, which contains 22 as substring.

Together with 30869983, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30869983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15434990 + 15434991.

It is an arithmetic number, because the mean of its divisors is an integer number (15434991).

Almost surely, 2^30869981 is an apocalyptic number.

It is an amenable number.

30869981 is a deficient number, since it is larger than the sum of its proper divisors (1).

30869981 is an equidigital number, since it uses as much as digits as its factorization.

30869981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 30869981 is about 5556.0760433961. The cubic root of 30869981 is about 313.6982679002.

The spelling of 30869981 in words is "thirty million, eight hundred sixty-nine thousand, nine hundred eighty-one".