2131857745 has 8 divisors (see below), whose sum is σ = 2566962216. Its totient is φ = 1699664256.

The previous prime is 2131857733. The next prime is 2131857757. The reversal of 2131857745 is 5477581312.

It is an interprime number because it is at equal distance from previous prime (2131857733) and next prime (2131857757).

It can be written as a sum of positive squares in 4 ways, for example, as 647142721 + 1484715024 = 25439^2 + 38532^2 .

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 2131857745 - 2²³ = 2123469137 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 726132 + ... + 729061.

It is an arithmetic number, because the mean of its divisors is an integer number (320870277).

Almost surely, 2^2131857745 is an apocalyptic number.

It is an amenable number.

2131857745 is a deficient number, since it is larger than the sum of its proper divisors (435104471).

2131857745 is a wasteful number, since it uses less digits than its factorization.

2131857745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1455491.

The product of its digits is 235200, while the sum is 43.

The square root of 2131857745 is about 46172.0450597545. The cubic root of 2131857745 is about 1287.0223058346.

The spelling of 2131857745 in words is "two billion, one hundred thirty-one million, eight hundred fifty-seven thousand, seven hundred forty-five".