30891053 has 4 divisors (see below), whose sum is σ = 31069788. Its totient is φ = 30712320.

The previous prime is 30891031. The next prime is 30891059. The reversal of 30891053 is 35019803.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15976009 + 14915044 = 3997^2 + 3862^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30891053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30891059) 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, 89108 + ... + 89453.

It is an arithmetic number, because the mean of its divisors is an integer number (7767447).

Almost surely, 2^30891053 is an apocalyptic number.

It is an amenable number.

30891053 is a deficient number, since it is larger than the sum of its proper divisors (178735).

30891053 is a wasteful number, since it uses less digits than its factorization.

30891053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178734.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 30891053 is about 5557.9720222398. The cubic root of 30891053 is about 313.7696289894.

The spelling of 30891053 in words is "thirty million, eight hundred ninety-one thousand, fifty-three".