30125531 has 4 divisors (see below), whose sum is σ = 30143064. Its totient is φ = 30108000.

The previous prime is 30125509. The next prime is 30125533. The reversal of 30125531 is 13552103.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 30125531 - 2⁶ = 30125467 is a prime.

It is a super-2 number, since 2×30125531² = 1815095236063922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30125533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5870 + ... + 9731.

It is an arithmetic number, because the mean of its divisors is an integer number (7535766).

Almost surely, 2^30125531 is an apocalyptic number.

30125531 is a deficient number, since it is larger than the sum of its proper divisors (17533).

30125531 is a wasteful number, since it uses less digits than its factorization.

30125531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17532.

The product of its (nonzero) digits is 450, while the sum is 20.

The square root of 30125531 is about 5488.6729725864. The cubic root of 30125531 is about 311.1560408419.

Adding to 30125531 its reverse (13552103), we get a palindrome (43677634).

The spelling of 30125531 in words is "thirty million, one hundred twenty-five thousand, five hundred thirty-one".