30146981 has 4 divisors (see below), whose sum is σ = 30221100. Its totient is φ = 30072864.

The previous prime is 30146957. The next prime is 30147031. The reversal of 30146981 is 18964103.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12716356 + 17430625 = 3566^2 + 4175^2 .

It is a cyclic number.

It is not a de Polignac number, because 30146981 - 2⁶ = 30146917 is a prime.

It is a super-2 number, since 2×30146981² = 1817680926828722, 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 (30146681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36446 + ... + 37263.

It is an arithmetic number, because the mean of its divisors is an integer number (7555275).

Almost surely, 2^30146981 is an apocalyptic number.

It is an amenable number.

30146981 is a deficient number, since it is larger than the sum of its proper divisors (74119).

30146981 is an equidigital number, since it uses as much as digits as its factorization.

30146981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74118.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 30146981 is about 5490.6266491176. The cubic root of 30146981 is about 311.2298731629.

The spelling of 30146981 in words is "thirty million, one hundred forty-six thousand, nine hundred eighty-one".