2131229729 has 2 divisors, whose sum is σ = 2131229730. Its totient is φ = 2131229728.

The previous prime is 2131229719. The next prime is 2131229741. The reversal of 2131229729 is 9279221312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1472794129 + 658435600 = 38377^2 + 25660^2 .

It is a cyclic number.

It is not a de Polignac number, because 2131229729 - 2²⁰ = 2130181153 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2131229692 and 2131229701.

It is not a weakly prime, because it can be changed into another prime (2131229719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1065614864 + 1065614865.

It is an arithmetic number, because the mean of its divisors is an integer number (1065614865).

Almost surely, 2^2131229729 is an apocalyptic number.

It is an amenable number.

2131229729 is a deficient number, since it is larger than the sum of its proper divisors (1).

2131229729 is an equidigital number, since it uses as much as digits as its factorization.

2131229729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 38.

The square root of 2131229729 is about 46165.2437337874. The cubic root of 2131229729 is about 1286.8959137268.

The spelling of 2131229729 in words is "two billion, one hundred thirty-one million, two hundred twenty-nine thousand, seven hundred twenty-nine".