2947121729 has 2 divisors, whose sum is σ = 2947121730. Its totient is φ = 2947121728.

The previous prime is 2947121701. The next prime is 2947121777. The reversal of 2947121729 is 9271217492.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2923889329 + 23232400 = 54073^2 + 4820^2 .

It is a cyclic number.

It is not a de Polignac number, because 2947121729 - 2²⁰ = 2946073153 is a prime.

It is a super-3 number, since 3×2947121729³ (a number of 29 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2947121729.

It is not a weakly prime, because it can be changed into another prime (2947121789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1473560864 + 1473560865.

It is an arithmetic number, because the mean of its divisors is an integer number (1473560865).

Almost surely, 2^2947121729 is an apocalyptic number.

It is an amenable number.

2947121729 is a deficient number, since it is larger than the sum of its proper divisors (1).

2947121729 is an equidigital number, since it uses as much as digits as its factorization.

2947121729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 127008, while the sum is 44.

The square root of 2947121729 is about 54287.3993574936. The cubic root of 2947121729 is about 1433.7255502748.

The spelling of 2947121729 in words is "two billion, nine hundred forty-seven million, one hundred twenty-one thousand, seven hundred twenty-nine".