2528918991 has 24 divisors (see below), whose sum is σ = 3746446704. Its totient is φ = 1642861440.

The previous prime is 2528918983. The next prime is 2528919037. The reversal of 2528918991 is 1998198252.

It is not a de Polignac number, because 2528918991 - 2³ = 2528918983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2528918921) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 345825 + ... + 353061.

It is an arithmetic number, because the mean of its divisors is an integer number (156101946).

Almost surely, 2^2528918991 is an apocalyptic number.

2528918991 is a deficient number, since it is larger than the sum of its proper divisors (1217527713).

2528918991 is a wasteful number, since it uses less digits than its factorization.

2528918991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8231 (or 8228 counting only the distinct ones).

The product of its digits is 933120, while the sum is 54.

The square root of 2528918991 is about 50288.3584043067. The cubic root of 2528918991 is about 1362.4219729859.

The spelling of 2528918991 in words is "two billion, five hundred twenty-eight million, nine hundred eighteen thousand, nine hundred ninety-one".