30891055 has 16 divisors (see below), whose sum is σ = 42023520. Its totient is φ = 21610368.

The previous prime is 30891031. The next prime is 30891059. The reversal of 30891055 is 55019803.

It is not a de Polignac number, because 30891055 - 2¹⁷ = 30759983 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 11272 + ... + 13741.

It is an arithmetic number, because the mean of its divisors is an integer number (2626470).

Almost surely, 2^30891055 is an apocalyptic number.

30891055 is a deficient number, since it is larger than the sum of its proper divisors (11132465).

30891055 is a wasteful number, since it uses less digits than its factorization.

30891055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25050.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 30891055 is about 5557.9722021615. The cubic root of 30891055 is about 313.7696357610.

The spelling of 30891055 in words is "thirty million, eight hundred ninety-one thousand, fifty-five".