30811013 has 4 divisors (see below), whose sum is σ = 30855180. Its totient is φ = 30766848.

The previous prime is 30811009. The next prime is 30811019. The reversal of 30811013 is 31011803.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31011803 = 251 ⋅123553.

It can be written as a sum of positive squares in 2 ways, for example, as 10543009 + 20268004 = 3247^2 + 4502^2 .

It is a cyclic number.

It is not a de Polignac number, because 30811013 - 2² = 30811009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30810982 and 30811000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30811019) 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, 21020 + ... + 22437.

It is an arithmetic number, because the mean of its divisors is an integer number (7713795).

Almost surely, 2^30811013 is an apocalyptic number.

It is an amenable number.

30811013 is a deficient number, since it is larger than the sum of its proper divisors (44167).

30811013 is an equidigital number, since it uses as much as digits as its factorization.

30811013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44166.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 30811013 is about 5550.7668839540. The cubic root of 30811013 is about 313.4983978883.

Adding to 30811013 its reverse (31011803), we get a palindrome (61822816).

The spelling of 30811013 in words is "thirty million, eight hundred eleven thousand, thirteen".