30505131 has 24 divisors (see below), whose sum is σ = 45752304. Its totient is φ = 19569600.

The previous prime is 30505121. The next prime is 30505133. The reversal of 30505131 is 13150503.

It is a happy number.

30505131 is a `hidden beast` number, since 30 + 505 + 131 = 666.

It is not a de Polignac number, because 30505131 - 2⁵ = 30505099 is a prime.

It is a super-2 number, since 2×30505131² = 1861126034654322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (30505133) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33180 + ... + 34086.

It is an arithmetic number, because the mean of its divisors is an integer number (1906346).

Almost surely, 2^30505131 is an apocalyptic number.

30505131 is a deficient number, since it is larger than the sum of its proper divisors (15247173).

30505131 is a wasteful number, since it uses less digits than its factorization.

30505131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1051 (or 1048 counting only the distinct ones).

The product of its (nonzero) digits is 225, while the sum is 18.

The square root of 30505131 is about 5523.1450279709. The cubic root of 30505131 is about 312.4575080358.

Adding to 30505131 its reverse (13150503), we get a palindrome (43655634).

The spelling of 30505131 in words is "thirty million, five hundred five thousand, one hundred thirty-one".