30138561 has 24 divisors (see below), whose sum is σ = 45791200. Its totient is φ = 19805472.

The previous prime is 30138551. The next prime is 30138601. The reversal of 30138561 is 16583103.

It is not a de Polignac number, because 30138561 - 2⁵ = 30138529 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30138551) 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, 16890 + ... + 18588.

Almost surely, 2^30138561 is an apocalyptic number.

It is an amenable number.

30138561 is a deficient number, since it is larger than the sum of its proper divisors (15652639).

30138561 is an equidigital number, since it uses as much as digits as its factorization.

30138561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1787 (or 1775 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 30138561 is about 5489.8598342763. The cubic root of 30138561 is about 311.2008951420.

The spelling of 30138561 in words is "thirty million, one hundred thirty-eight thousand, five hundred sixty-one".