2231816781373 has 4 divisors (see below), whose sum is σ = 2253484905568. Its totient is φ = 2210148657180.

The previous prime is 2231816781367. The next prime is 2231816781391. The reversal of 2231816781373 is 3731876181322.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2231816781373 - 2³⁷ = 2094377827901 is a prime.

It is a super-3 number, since 3×2231816781373³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2231816781373.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2231816781473) 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, 10834061943 + ... + 10834062148.

It is an arithmetic number, because the mean of its divisors is an integer number (563371226392).

Almost surely, 2^{2231816781373} is an apocalyptic number.

It is an amenable number.

2231816781373 is a deficient number, since it is larger than the sum of its proper divisors (21668124195).

2231816781373 is a wasteful number, since it uses less digits than its factorization.

2231816781373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21668124194.

The product of its digits is 2032128, while the sum is 52.

The spelling of 2231816781373 in words is "two trillion, two hundred thirty-one billion, eight hundred sixteen million, seven hundred eighty-one thousand, three hundred seventy-three".