30541981 has 4 divisors (see below), whose sum is σ = 30597372. Its totient is φ = 30486592.

The previous prime is 30541967. The next prime is 30542011. The reversal of 30541981 is 18914503.

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 8357881 + 22184100 = 2891^2 + 4710^2 .

It is a cyclic number.

It is not a de Polignac number, because 30541981 - 2⁷ = 30541853 is a prime.

It is a super-2 number, since 2×30541981² = 1865625206808722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30541961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26860 + ... + 27973.

It is an arithmetic number, because the mean of its divisors is an integer number (7649343).

Almost surely, 2^30541981 is an apocalyptic number.

It is an amenable number.

30541981 is a deficient number, since it is larger than the sum of its proper divisors (55391).

30541981 is an equidigital number, since it uses as much as digits as its factorization.

30541981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55390.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 30541981 is about 5526.4799827738. The cubic root of 30541981 is about 312.5832729547.

The spelling of 30541981 in words is "thirty million, five hundred forty-one thousand, nine hundred eighty-one".