23231505 has 16 divisors (see below), whose sum is σ = 40549824. Its totient is φ = 11263680.

The previous prime is 23231491. The next prime is 23231539. The reversal of 23231505 is 50513232.

It is not a de Polignac number, because 23231505 - 2⁵ = 23231473 is a prime.

It is a super-3 number, since 3×23231505³ (a number of 23 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70234 + ... + 70563.

It is an arithmetic number, because the mean of its divisors is an integer number (2534364).

Almost surely, 2^23231505 is an apocalyptic number.

It is an amenable number.

23231505 is a deficient number, since it is larger than the sum of its proper divisors (17318319).

23231505 is a wasteful number, since it uses less digits than its factorization.

23231505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140816.

The product of its (nonzero) digits is 900, while the sum is 21.

The square root of 23231505 is about 4819.9071567822. The cubic root of 23231505 is about 285.3376730144.

Adding to 23231505 its reverse (50513232), we get a palindrome (73744737).

It can be divided in two parts, 2323 and 1505, that added together give a triangular number (3828 = T₈₇).

The spelling of 23231505 in words is "twenty-three million, two hundred thirty-one thousand, five hundred five".