30505525 has 12 divisors (see below), whose sum is σ = 37996452. Its totient is φ = 24295040.

The previous prime is 30505499. The next prime is 30505529. The reversal of 30505525 is 52550503.

It can be written as a sum of positive squares in 6 ways, for example, as 321489 + 30184036 = 567^2 + 5494^2 .

It is not a de Polignac number, because 30505525 - 2⁵ = 30505493 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 30505525.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30505529) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3207 + ... + 8443.

It is an arithmetic number, because the mean of its divisors is an integer number (3166371).

Almost surely, 2^30505525 is an apocalyptic number.

It is an amenable number.

30505525 is a deficient number, since it is larger than the sum of its proper divisors (7490927).

30505525 is a wasteful number, since it uses less digits than its factorization.

30505525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5480 (or 5475 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 25.

The square root of 30505525 is about 5523.1806959396. The cubic root of 30505525 is about 312.4588532491.

30505525 divided by its sum of digits (25) gives a palindrome (1220221).

The spelling of 30505525 in words is "thirty million, five hundred five thousand, five hundred twenty-five".