2528017891 has 4 divisors (see below), whose sum is σ = 2889163312. Its totient is φ = 2166872472.

The previous prime is 2528017879. The next prime is 2528017907. The reversal of 2528017891 is 1987108252.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 2528017891 - 2⁷ = 2528017763 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2528017871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 180572700 + ... + 180572713.

It is an arithmetic number, because the mean of its divisors is an integer number (722290828).

Almost surely, 2^2528017891 is an apocalyptic number.

2528017891 is a deficient number, since it is larger than the sum of its proper divisors (361145421).

2528017891 is an equidigital number, since it uses as much as digits as its factorization.

2528017891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361145420.

The product of its (nonzero) digits is 80640, while the sum is 43.

The square root of 2528017891 is about 50279.3982760335. The cubic root of 2528017891 is about 1362.2601351561.

The spelling of 2528017891 in words is "two billion, five hundred twenty-eight million, seventeen thousand, eight hundred ninety-one".