2231681505373 has 4 divisors (see below), whose sum is σ = 2362956888060. Its totient is φ = 2100406122688.

The previous prime is 2231681505331. The next prime is 2231681505397. The reversal of 2231681505373 is 3735051861322.

It is a happy number.

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 1977586875289 + 254094630084 = 1406267^2 + 504078^2 .

It is a cyclic number.

It is not a de Polignac number, because 2231681505373 - 2²⁵ = 2231647950941 is a prime.

It is a super-3 number, since 3×2231681505373³ (a number of 38 digits) contains 333 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 (2231681505073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65637691318 + ... + 65637691351.

It is an arithmetic number, because the mean of its divisors is an integer number (590739222015).

Almost surely, 2^{2231681505373} is an apocalyptic number.

It is an amenable number.

2231681505373 is a deficient number, since it is larger than the sum of its proper divisors (131275382687).

2231681505373 is a wasteful number, since it uses less digits than its factorization.

2231681505373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131275382686.

The product of its (nonzero) digits is 907200, while the sum is 46.

The spelling of 2231681505373 in words is "two trillion, two hundred thirty-one billion, six hundred eighty-one million, five hundred five thousand, three hundred seventy-three".