23131405514545 has 8 divisors (see below), whose sum is σ = 27872863741800. Its totient is φ = 18428339662080.

The previous prime is 23131405514537. The next prime is 23131405514563. The reversal of 23131405514545 is 54541550413132.

It can be written as a sum of positive squares in 4 ways, for example, as 8955630819216 + 14175774695329 = 2992596^2 + 3765073^2 .

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

It is not a de Polignac number, because 23131405514545 - 2³ = 23131405514537 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9598092370 + ... + 9598094779.

It is an arithmetic number, because the mean of its divisors is an integer number (3484107967725).

Almost surely, 2^{23131405514545} is an apocalyptic number.

It is an amenable number.

23131405514545 is a deficient number, since it is larger than the sum of its proper divisors (4741458227255).

23131405514545 is a wasteful number, since it uses less digits than its factorization.

23131405514545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19196187395.

The product of its (nonzero) digits is 720000, while the sum is 43.

Adding to 23131405514545 its reverse (54541550413132), we get a palindrome (77672955927677).

The spelling of 23131405514545 in words is "twenty-three trillion, one hundred thirty-one billion, four hundred five million, five hundred fourteen thousand, five hundred forty-five".