30985561 has 16 divisors (see below), whose sum is σ = 33580800. Its totient is φ = 28501200.

The previous prime is 30985553. The next prime is 30985573. The reversal of 30985561 is 16558903.

It is a cyclic number.

It is not a de Polignac number, because 30985561 - 2³ = 30985553 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 30985561.

It is not an unprimeable number, because it can be changed into a prime (30985541) 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, 146746 + ... + 146956.

It is an arithmetic number, because the mean of its divisors is an integer number (2098800).

Almost surely, 2^30985561 is an apocalyptic number.

It is an amenable number.

30985561 is a deficient number, since it is larger than the sum of its proper divisors (2595239).

30985561 is a wasteful number, since it uses less digits than its factorization.

30985561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420.

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 30985561 is about 5566.4675513291. The cubic root of 30985561 is about 314.0892851969.

The spelling of 30985561 in words is "thirty million, nine hundred eighty-five thousand, five hundred sixty-one".