2158750681 has 8 divisors (see below), whose sum is σ = 2217702344. Its totient is φ = 2099831040.

The previous prime is 2158750639. The next prime is 2158750687. The reversal of 2158750681 is 1860578512.

It can be written as a sum of positive squares in 4 ways, for example, as 1114491456 + 1044259225 = 33384^2 + 32315^2 .

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 2158750681 - 2¹³ = 2158742489 is a prime.

It is a super-2 number, since 2×2158750681² = 9320409005435927522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2158750687) 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 7 ways as a sum of consecutive naturals, for example, 204001 + ... + 214321.

It is an arithmetic number, because the mean of its divisors is an integer number (277212793).

Almost surely, 2^2158750681 is an apocalyptic number.

It is an amenable number.

2158750681 is a deficient number, since it is larger than the sum of its proper divisors (58951663).

2158750681 is a wasteful number, since it uses less digits than its factorization.

2158750681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16011.

The product of its (nonzero) digits is 134400, while the sum is 43.

The square root of 2158750681 is about 46462.3576780172. The cubic root of 2158750681 is about 1292.4115459372.

The spelling of 2158750681 in words is "two billion, one hundred fifty-eight million, seven hundred fifty thousand, six hundred eighty-one".