30645133 has 4 divisors (see below), whose sum is σ = 30656608. Its totient is φ = 30633660.

The previous prime is 30645089. The next prime is 30645137. The reversal of 30645133 is 33154603.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 33154603 = 2777 ⋅11939.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30645133 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30645098 and 30645107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30645137) 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, 610 + ... + 7852.

It is an arithmetic number, because the mean of its divisors is an integer number (7664152).

Almost surely, 2^30645133 is an apocalyptic number.

It is an amenable number.

30645133 is a deficient number, since it is larger than the sum of its proper divisors (11475).

30645133 is an equidigital number, since it uses as much as digits as its factorization.

30645133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11474.

The product of its (nonzero) digits is 3240, while the sum is 25.

The square root of 30645133 is about 5535.8046388940. The cubic root of 30645133 is about 312.9347821126.

Adding to 30645133 its reverse (33154603), we get a palindrome (63799736).

The spelling of 30645133 in words is "thirty million, six hundred forty-five thousand, one hundred thirty-three".