2152878557 has 4 divisors (see below), whose sum is σ = 2153279676. Its totient is φ = 2152477440.

The previous prime is 2152878493. The next prime is 2152878571. The reversal of 2152878557 is 7558782512.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1983722521 + 169156036 = 44539^2 + 13006^2 .

It is a cyclic number.

It is not a de Polignac number, because 2152878557 - 2⁶ = 2152878493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2152878577) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 192398 + ... + 203279.

It is an arithmetic number, because the mean of its divisors is an integer number (538319919).

Almost surely, 2^2152878557 is an apocalyptic number.

It is an amenable number.

2152878557 is a deficient number, since it is larger than the sum of its proper divisors (401119).

2152878557 is an equidigital number, since it uses as much as digits as its factorization.

2152878557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401118.

The product of its digits is 1568000, while the sum is 50.

The square root of 2152878557 is about 46399.1223731656. The cubic root of 2152878557 is about 1291.2386310356.

The spelling of 2152878557 in words is "two billion, one hundred fifty-two million, eight hundred seventy-eight thousand, five hundred fifty-seven".