23205001531 has 4 divisors (see below), whose sum is σ = 23430292912. Its totient is φ = 22979710152.

The previous prime is 23205001493. The next prime is 23205001559. The reversal of 23205001531 is 13510050232.

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 23205001531 - 2⁷ = 23205001403 is a prime.

It is a super-2 number, since 2×23205001531² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23205001571) 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, 112645536 + ... + 112645741.

It is an arithmetic number, because the mean of its divisors is an integer number (5857573228).

Almost surely, 2^23205001531 is an apocalyptic number.

23205001531 is a deficient number, since it is larger than the sum of its proper divisors (225291381).

23205001531 is a wasteful number, since it uses less digits than its factorization.

23205001531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225291380.

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

Adding to 23205001531 its reverse (13510050232), we get a palindrome (36715051763).

The spelling of 23205001531 in words is "twenty-three billion, two hundred five million, one thousand, five hundred thirty-one".