2531431404545 has 4 divisors (see below), whose sum is σ = 3037717685460. Its totient is φ = 2025145123632.

The previous prime is 2531431404527. The next prime is 2531431404553. The reversal of 2531431404545 is 5454041341352.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1046545368064 + 1484886036481 = 1023008^2 + 1218559^2 .

It is a cyclic number.

It is not a de Polignac number, because 2531431404545 - 2⁸ = 2531431404289 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 253143140450 + ... + 253143140459.

It is an arithmetic number, because the mean of its divisors is an integer number (759429421365).

Almost surely, 2^{2531431404545} is an apocalyptic number.

It is an amenable number.

2531431404545 is a deficient number, since it is larger than the sum of its proper divisors (506286280915).

2531431404545 is an equidigital number, since it uses as much as digits as its factorization.

2531431404545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506286280914.

The product of its (nonzero) digits is 576000, while the sum is 41.

Adding to 2531431404545 its reverse (5454041341352), we get a palindrome (7985472745897).

The spelling of 2531431404545 in words is "two trillion, five hundred thirty-one billion, four hundred thirty-one million, four hundred four thousand, five hundred forty-five".