71429209 has 2 divisors, whose sum is σ = 71429210. Its totient is φ = 71429208.

The previous prime is 71429201. The next prime is 71429261. The reversal of 71429209 is 90292417.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45265984 + 26163225 = 6728^2 + 5115^2 .

It is a cyclic number.

It is not a de Polignac number, because 71429209 - 2³ = 71429201 is a prime.

It is equal to p_4197148 and since 71429209 and 4197148 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (71429201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35714604 + 35714605.

It is an arithmetic number, because the mean of its divisors is an integer number (35714605).

Almost surely, 2^71429209 is an apocalyptic number.

It is an amenable number.

71429209 is a deficient number, since it is larger than the sum of its proper divisors (1).

71429209 is an equidigital number, since it uses as much as digits as its factorization.

71429209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 71429209 is about 8451.5802664354. The cubic root of 71429209 is about 414.9145011847.

The spelling of 71429209 in words is "seventy-one million, four hundred twenty-nine thousand, two hundred nine".