30493891 has 2 divisors, whose sum is σ = 30493892. Its totient is φ = 30493890.

The previous prime is 30493867. The next prime is 30493919. The reversal of 30493891 is 19839403.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 30493891 - 2¹¹ = 30491843 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 30493891.

It is not a weakly prime, because it can be changed into another prime (30493811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15246945 + 15246946.

It is an arithmetic number, because the mean of its divisors is an integer number (15246946).

Almost surely, 2^30493891 is an apocalyptic number.

30493891 is the 3493-rd centered pentagonal number.

30493891 is a deficient number, since it is larger than the sum of its proper divisors (1).

30493891 is an equidigital number, since it uses as much as digits as its factorization.

30493891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 30493891 is about 5522.1273980233. The cubic root of 30493891 is about 312.4191270191.

The spelling of 30493891 in words is "thirty million, four hundred ninety-three thousand, eight hundred ninety-one".