2545431887 has 4 divisors (see below), whose sum is σ = 2547711816. Its totient is φ = 2543151960.

The previous prime is 2545431871. The next prime is 2545431923. The reversal of 2545431887 is 7881345452.

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 2545431887 - 2⁴ = 2545431871 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 (2545431857) 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, 1138289 + ... + 1140522.

It is an arithmetic number, because the mean of its divisors is an integer number (636927954).

Almost surely, 2^2545431887 is an apocalyptic number.

2545431887 is a deficient number, since it is larger than the sum of its proper divisors (2279929).

2545431887 is a wasteful number, since it uses less digits than its factorization.

2545431887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2279928.

The product of its digits is 1075200, while the sum is 47.

The square root of 2545431887 is about 50452.2733580956. The cubic root of 2545431887 is about 1365.3809108380.

The spelling of 2545431887 in words is "two billion, five hundred forty-five million, four hundred thirty-one thousand, eight hundred eighty-seven".