30881005 has 4 divisors (see below), whose sum is σ = 37057212. Its totient is φ = 24704800.

The previous prime is 30881003. The next prime is 30881029. The reversal of 30881005 is 50018803.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50018803 = 53 ⋅943751.

It can be written as a sum of positive squares in 2 ways, for example, as 3976036 + 26904969 = 1994^2 + 5187^2 .

It is not a de Polignac number, because 30881005 - 2¹ = 30881003 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30881003) 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, 3088096 + ... + 3088105.

It is an arithmetic number, because the mean of its divisors is an integer number (9264303).

Almost surely, 2^30881005 is an apocalyptic number.

It is an amenable number.

30881005 is a deficient number, since it is larger than the sum of its proper divisors (6176207).

30881005 is an equidigital number, since it uses as much as digits as its factorization.

30881005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6176206.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 30881005 is about 5557.0680218979. The cubic root of 30881005 is about 313.7356051236.

Adding to 30881005 its reverse (50018803), we get a palindrome (80899808).

The spelling of 30881005 in words is "thirty million, eight hundred eighty-one thousand, five".