23891513 has 8 divisors (see below), whose sum is σ = 24323208. Its totient is φ = 23462784.

The previous prime is 23891507. The next prime is 23891533. The reversal of 23891513 is 31519832.

It can be written as a sum of positive squares in 4 ways, for example, as 3892729 + 19998784 = 1973^2 + 4472^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 23891513 - 2¹⁴ = 23875129 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 23891513.

It is not an unprimeable number, because it can be changed into a prime (23891533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20831 + ... + 21947.

It is an arithmetic number, because the mean of its divisors is an integer number (3040401).

Almost surely, 2^23891513 is an apocalyptic number.

It is an amenable number.

23891513 is a deficient number, since it is larger than the sum of its proper divisors (431695).

23891513 is a wasteful number, since it uses less digits than its factorization.

23891513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1483.

The product of its digits is 6480, while the sum is 32.

The square root of 23891513 is about 4887.8945365055. The cubic root of 23891513 is about 288.0146316190.

The spelling of 23891513 in words is "twenty-three million, eight hundred ninety-one thousand, five hundred thirteen".