2921079781 has 6 divisors (see below), whose sum is σ = 3025280882. Its totient is φ = 2820352080.

The previous prime is 2921079767. The next prime is 2921079797. The reversal of 2921079781 is 1879701292.

2921079781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 178462881 + 2742616900 = 13359^2 + 52370^2 .

It is not a de Polignac number, because 2921079781 - 2⁹ = 2921079269 is a prime.

It is a super-2 number, since 2×2921079781² = 17065414173934015922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2921079731) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1735830 + ... + 1737511.

Almost surely, 2^2921079781 is an apocalyptic number.

It is an amenable number.

2921079781 is a deficient number, since it is larger than the sum of its proper divisors (104201101).

2921079781 is an equidigital number, since it uses as much as digits as its factorization.

2921079781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3473399 (or 3473370 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 46.

The square root of 2921079781 is about 54047.0145428959. The cubic root of 2921079781 is about 1429.4900591002.

The spelling of 2921079781 in words is "two billion, nine hundred twenty-one million, seventy-nine thousand, seven hundred eighty-one".