2781179961 has 16 divisors (see below), whose sum is σ = 4239919488. Its totient is φ = 1588521600.

The previous prime is 2781179917. The next prime is 2781180013. The reversal of 2781179961 is 1699711872.

It is a happy number.

It is not a de Polignac number, because 2781179961 - 2¹⁷ = 2781048889 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2781179561) 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, 18871 + ... + 76931.

It is an arithmetic number, because the mean of its divisors is an integer number (264994968).

Almost surely, 2^2781179961 is an apocalyptic number.

2781179961 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2781179961 is a deficient number, since it is larger than the sum of its proper divisors (1458739527).

2781179961 is a wasteful number, since it uses less digits than its factorization.

2781179961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60352.

The product of its digits is 381024, while the sum is 51.

The square root of 2781179961 is about 52736.8937367380. The cubic root of 2781179961 is about 1406.2947771856.

The spelling of 2781179961 in words is "two billion, seven hundred eighty-one million, one hundred seventy-nine thousand, nine hundred sixty-one".