30842981 has 16 divisors (see below), whose sum is σ = 35711424. Its totient is φ = 26383104.

The previous prime is 30842971. The next prime is 30842983. The reversal of 30842981 is 18924803.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30842981 is a prime.

It is a super-2 number, since 2×30842981² = 1902578953932722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30842983) 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, 13766 + ... + 15848.

It is an arithmetic number, because the mean of its divisors is an integer number (2231964).

Almost surely, 2^30842981 is an apocalyptic number.

It is an amenable number.

30842981 is a deficient number, since it is larger than the sum of its proper divisors (4868443).

30842981 is a wasteful number, since it uses less digits than its factorization.

30842981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2180.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 30842981 is about 5553.6457395120. The cubic root of 30842981 is about 313.6067839460.

The spelling of 30842981 in words is "thirty million, eight hundred forty-two thousand, nine hundred eighty-one".