215243429 has 2 divisors, whose sum is σ = 215243430. Its totient is φ = 215243428.

The previous prime is 215243401. The next prime is 215243437. The reversal of 215243429 is 924342512.

215243429 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119399329 + 95844100 = 10927^2 + 9790^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215243429 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 215243395 and 215243404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215243449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107621714 + 107621715.

It is an arithmetic number, because the mean of its divisors is an integer number (107621715).

Almost surely, 2^215243429 is an apocalyptic number.

It is an amenable number.

215243429 is a deficient number, since it is larger than the sum of its proper divisors (1).

215243429 is an equidigital number, since it uses as much as digits as its factorization.

215243429 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 32.

The square root of 215243429 is about 14671.1768103312. The cubic root of 215243429 is about 599.2986518002.

The spelling of 215243429 in words is "two hundred fifteen million, two hundred forty-three thousand, four hundred twenty-nine".