2781561495 has 16 divisors (see below), whose sum is σ = 4454125920. Its totient is φ = 1482290304.

The previous prime is 2781561457. The next prime is 2781561499. The reversal of 2781561495 is 5941651872.

It is a happy number.

2781561495 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2781561495 - 2¹⁰ = 2781560471 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2781561499) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56400 + ... + 93509.

It is an arithmetic number, because the mean of its divisors is an integer number (278382870).

Almost surely, 2^2781561495 is an apocalyptic number.

2781561495 is a deficient number, since it is larger than the sum of its proper divisors (1672564425).

2781561495 is a wasteful number, since it uses less digits than its factorization.

2781561495 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151154.

The product of its digits is 604800, while the sum is 48.

The square root of 2781561495 is about 52740.5109474681. The cubic root of 2781561495 is about 1406.3590813952.

The spelling of 2781561495 in words is "two billion, seven hundred eighty-one million, five hundred sixty-one thousand, four hundred ninety-five".