2031540345 has 20 divisors (see below), whose sum is σ = 3641724900. Its totient is φ = 1083487968.

The previous prime is 2031540319. The next prime is 2031540347. The reversal of 2031540345 is 5430451302.

2031540345 is a `hidden beast` number, since 2 + 0 + 315 + 4 + 0 + 345 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1206242361 + 825297984 = 34731^2 + 28728^2 .

It is not a de Polignac number, because 2031540345 - 2¹⁷ = 2031409273 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (2031540347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2507670 + ... + 2508479.

It is an arithmetic number, because the mean of its divisors is an integer number (182086245).

Almost surely, 2^2031540345 is an apocalyptic number.

It is an amenable number.

2031540345 is a deficient number, since it is larger than the sum of its proper divisors (1610184555).

2031540345 is an equidigital number, since it uses as much as digits as its factorization.

2031540345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5016166 (or 5016157 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 2031540345 is about 45072.6119167727. The cubic root of 2031540345 is about 1266.5095935962.

Adding to 2031540345 its reverse (5430451302), we get a palindrome (7461991647).

The spelling of 2031540345 in words is "two billion, thirty-one million, five hundred forty thousand, three hundred forty-five".