30685771 has 4 divisors (see below), whose sum is σ = 30820000. Its totient is φ = 30551544.

The previous prime is 30685763. The next prime is 30685777. The reversal of 30685771 is 17758603.

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

It is a cyclic number.

It is not a de Polignac number, because 30685771 - 2³ = 30685763 is a prime.

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 30685771.

It is not an unprimeable number, because it can be changed into a prime (30685777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66771 + ... + 67228.

It is an arithmetic number, because the mean of its divisors is an integer number (7705000).

Almost surely, 2^30685771 is an apocalyptic number.

30685771 is a deficient number, since it is larger than the sum of its proper divisors (134229).

30685771 is a wasteful number, since it uses less digits than its factorization.

30685771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134228.

The product of its (nonzero) digits is 35280, while the sum is 37.

The square root of 30685771 is about 5539.4738919865. The cubic root of 30685771 is about 313.0730468796.

The spelling of 30685771 in words is "thirty million, six hundred eighty-five thousand, seven hundred seventy-one".