2547889961 has 4 divisors (see below), whose sum is σ = 2549471172. Its totient is φ = 2546308752.

The previous prime is 2547889957. The next prime is 2547889963. The reversal of 2547889961 is 1699887452.

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 1793014336 + 754875625 = 42344^2 + 27475^2 .

It is a cyclic number.

It is not a de Polignac number, because 2547889961 - 2² = 2547889957 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2547889961.

It is not an unprimeable number, because it can be changed into a prime (2547889963) 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, 788186 + ... + 791411.

It is an arithmetic number, because the mean of its divisors is an integer number (637367793).

Almost surely, 2^2547889961 is an apocalyptic number.

It is an amenable number.

2547889961 is a deficient number, since it is larger than the sum of its proper divisors (1581211).

2547889961 is a wasteful number, since it uses less digits than its factorization.

2547889961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1581210.

The product of its digits is 8709120, while the sum is 59.

The square root of 2547889961 is about 50476.6278687473. The cubic root of 2547889961 is about 1365.8202766908.

The spelling of 2547889961 in words is "two billion, five hundred forty-seven million, eight hundred eighty-nine thousand, nine hundred sixty-one".