30811145 has 16 divisors (see below), whose sum is σ = 38938752. Its totient is φ = 23358720.

The previous prime is 30811133. The next prime is 30811147. The reversal of 30811145 is 54111803.

It is not a de Polignac number, because 30811145 - 2¹⁰ = 30810121 is a prime.

It is a super-2 number, since 2×30811145² = 1898653312422050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 30811145.

It is not an unprimeable number, because it can be changed into a prime (30811147) 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, 11810 + ... + 14180.

It is an arithmetic number, because the mean of its divisors is an integer number (2433672).

Almost surely, 2^30811145 is an apocalyptic number.

It is an amenable number.

30811145 is a deficient number, since it is larger than the sum of its proper divisors (8127607).

30811145 is a wasteful number, since it uses less digits than its factorization.

30811145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2512.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 30811145 is about 5550.7787741902. The cubic root of 30811145 is about 313.4988455825.

Adding to 30811145 its reverse (54111803), we get a palindrome (84922948).

The spelling of 30811145 in words is "thirty million, eight hundred eleven thousand, one hundred forty-five".