2731345921 has 8 divisors (see below), whose sum is σ = 2824773120. Its totient is φ = 2639390208.

The previous prime is 2731345909. The next prime is 2731345927. The reversal of 2731345921 is 1295431372.

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

It is a cyclic number.

It is not a de Polignac number, because 2731345921 - 2¹³ = 2731337729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2731345927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 364096 + ... + 371521.

It is an arithmetic number, because the mean of its divisors is an integer number (353096640).

Almost surely, 2^2731345921 is an apocalyptic number.

It is an amenable number.

2731345921 is a deficient number, since it is larger than the sum of its proper divisors (93427199).

2731345921 is an equidigital number, since it uses as much as digits as its factorization.

2731345921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 735743.

The product of its digits is 45360, while the sum is 37.

The square root of 2731345921 is about 52262.2800976000. The cubic root of 2731345921 is about 1397.8446291487.

The spelling of 2731345921 in words is "two billion, seven hundred thirty-one million, three hundred forty-five thousand, nine hundred twenty-one".