30145531 has 16 divisors (see below), whose sum is σ = 33264000. Its totient is φ = 27151488.

The previous prime is 30145483. The next prime is 30145561. The reversal of 30145531 is 13554103.

It is a happy number.

It is not a de Polignac number, because 30145531 - 2¹¹ = 30143483 is a prime.

It is a super-2 number, since 2×30145531² = 1817506078543922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30145561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 152925 + ... + 153121.

It is an arithmetic number, because the mean of its divisors is an integer number (2079000).

Almost surely, 2^30145531 is an apocalyptic number.

30145531 is a deficient number, since it is larger than the sum of its proper divisors (3118469).

30145531 is a wasteful number, since it uses less digits than its factorization.

30145531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 30145531 is about 5490.4946043139. The cubic root of 30145531 is about 311.2248832708.

Adding to 30145531 its reverse (13554103), we get a palindrome (43699634).

The spelling of 30145531 in words is "thirty million, one hundred forty-five thousand, five hundred thirty-one".