2145544305631 has 4 divisors (see below), whose sum is σ = 2145548603952. Its totient is φ = 2145540007312.

The previous prime is 2145544305607. The next prime is 2145544305647. The reversal of 2145544305631 is 1365034455412.

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 2145544305631 - 2²⁵ = 2145510751199 is a prime.

It is a super-2 number, since 2×2145544305631² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145544305601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1284451 + ... + 2437396.

It is an arithmetic number, because the mean of its divisors is an integer number (536387150988).

Almost surely, 2^{2145544305631} is an apocalyptic number.

2145544305631 is a deficient number, since it is larger than the sum of its proper divisors (4298321).

2145544305631 is an equidigital number, since it uses as much as digits as its factorization.

2145544305631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4298320.

The product of its (nonzero) digits is 864000, while the sum is 43.

The spelling of 2145544305631 in words is "two trillion, one hundred forty-five billion, five hundred forty-four million, three hundred five thousand, six hundred thirty-one".