30893881 has 2 divisors, whose sum is σ = 30893882. Its totient is φ = 30893880.

The previous prime is 30893851. The next prime is 30893917. The reversal of 30893881 is 18839803.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26873856 + 4020025 = 5184^2 + 2005^2 .

It is an emirp because it is prime and its reverse (18839803) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30893881 - 2¹⁹ = 30369593 is a prime.

It is a super-2 number, since 2×30893881² = 1908863766484322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (30893851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15446940 + 15446941.

It is an arithmetic number, because the mean of its divisors is an integer number (15446941).

Almost surely, 2^30893881 is an apocalyptic number.

It is an amenable number.

30893881 is a deficient number, since it is larger than the sum of its proper divisors (1).

30893881 is an equidigital number, since it uses as much as digits as its factorization.

30893881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 30893881 is about 5558.2264257585. The cubic root of 30893881 is about 313.7792036435.

The spelling of 30893881 in words is "thirty million, eight hundred ninety-three thousand, eight hundred eighty-one".