230001561 has 6 divisors (see below), whose sum is σ = 332224490. Its totient is φ = 153334368.

The previous prime is 230001557. The next prime is 230001601. The reversal of 230001561 is 165100032.

It can be written as a sum of positive squares in only one way, i.e., 229977225 + 24336 = 15165^2 + 156^2 .

It is not a de Polignac number, because 230001561 - 2² = 230001557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (230001511) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12777856 + ... + 12777873.

Almost surely, 2^230001561 is an apocalyptic number.

It is an amenable number.

230001561 is a deficient number, since it is larger than the sum of its proper divisors (102222929).

230001561 is a wasteful number, since it uses less digits than its factorization.

230001561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25555735 (or 25555732 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 230001561 is about 15165.8023526617. The cubic root of 230001561 is about 612.6939536256.

Adding to 230001561 its reverse (165100032), we get a palindrome (395101593).

The spelling of 230001561 in words is "two hundred thirty million, one thousand, five hundred sixty-one".