30891129 has 4 divisors (see below), whose sum is σ = 41188176. Its totient is φ = 20594084.

The previous prime is 30891121. The next prime is 30891167. The reversal of 30891129 is 92119803.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 30891129 - 2³ = 30891121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 30891129.

It is not an unprimeable number, because it can be changed into a prime (30891121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5148519 + ... + 5148524.

It is an arithmetic number, because the mean of its divisors is an integer number (10297044).

Almost surely, 2^30891129 is an apocalyptic number.

It is an amenable number.

30891129 is a deficient number, since it is larger than the sum of its proper divisors (10297047).

30891129 is a wasteful number, since it uses less digits than its factorization.

30891129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10297046.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 30891129 is about 5557.9788592617. The cubic root of 30891129 is about 313.7698863074.

The spelling of 30891129 in words is "thirty million, eight hundred ninety-one thousand, one hundred twenty-nine".