87209429 has 2 divisors, whose sum is σ = 87209430. Its totient is φ = 87209428.

The previous prime is 87209413. The next prime is 87209431. The reversal of 87209429 is 92490278.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47582404 + 39627025 = 6898^2 + 6295^2 .

It is a cyclic number.

It is not a de Polignac number, because 87209429 - 2⁴ = 87209413 is a prime.

It is a Sophie Germain prime.

Together with 87209431, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87209459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43604714 + 43604715.

It is an arithmetic number, because the mean of its divisors is an integer number (43604715).

Almost surely, 2^87209429 is an apocalyptic number.

It is an amenable number.

87209429 is a deficient number, since it is larger than the sum of its proper divisors (1).

87209429 is an equidigital number, since it uses as much as digits as its factorization.

87209429 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 87209429 is about 9338.5988777760. The cubic root of 87209429 is about 443.4600289273.

The spelling of 87209429 in words is "eighty-seven million, two hundred nine thousand, four hundred twenty-nine".