2158819257 has 32 divisors (see below), whose sum is σ = 3370954752. Its totient is φ = 1203197184.

The previous prime is 2158819253. The next prime is 2158819277. The reversal of 2158819257 is 7529188512.

It is not a de Polignac number, because 2158819257 - 2² = 2158819253 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2158819253) 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 31 ways as a sum of consecutive naturals, for example, 881008 + ... + 883454.

It is an arithmetic number, because the mean of its divisors is an integer number (105342336).

Almost surely, 2^2158819257 is an apocalyptic number.

It is an amenable number.

2158819257 is a deficient number, since it is larger than the sum of its proper divisors (1212135495).

2158819257 is a wasteful number, since it uses less digits than its factorization.

2158819257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3477.

The product of its digits is 403200, while the sum is 48.

The square root of 2158819257 is about 46463.0956458994. The cubic root of 2158819257 is about 1292.4252309320.

The spelling of 2158819257 in words is "two billion, one hundred fifty-eight million, eight hundred nineteen thousand, two hundred fifty-seven".