30542981 has 8 divisors (see below), whose sum is σ = 35385024. Its totient is φ = 25820640.

The previous prime is 30542971. The next prime is 30542983. The reversal of 30542981 is 18924503.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 30542981 - 2¹⁰ = 30541957 is a prime.

It is a super-2 number, since 2×30542981² = 1865747376732722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30542983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29375 + ... + 30396.

It is an arithmetic number, because the mean of its divisors is an integer number (4423128).

Almost surely, 2^30542981 is an apocalyptic number.

It is an amenable number.

30542981 is a deficient number, since it is larger than the sum of its proper divisors (4842043).

30542981 is an equidigital number, since it uses as much as digits as its factorization.

30542981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59851.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 30542981 is about 5526.5704555357. The cubic root of 30542981 is about 312.5866844324.

The spelling of 30542981 in words is "thirty million, five hundred forty-two thousand, nine hundred eighty-one".