87175729 has 2 divisors, whose sum is σ = 87175730. Its totient is φ = 87175728.

The previous prime is 87175691. The next prime is 87175733. The reversal of 87175729 is 92757178.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84217329 + 2958400 = 9177^2 + 1720^2 .

It is a cyclic number.

It is not a de Polignac number, because 87175729 - 2¹³ = 87167537 is a prime.

It is not a weakly prime, because it can be changed into another prime (87175229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43587864 + 43587865.

It is an arithmetic number, because the mean of its divisors is an integer number (43587865).

Almost surely, 2^87175729 is an apocalyptic number.

It is an amenable number.

87175729 is a deficient number, since it is larger than the sum of its proper divisors (1).

87175729 is an equidigital number, since it uses as much as digits as its factorization.

87175729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 246960, while the sum is 46.

The square root of 87175729 is about 9336.7943642344. The cubic root of 87175729 is about 443.4029000574.

The spelling of 87175729 in words is "eighty-seven million, one hundred seventy-five thousand, seven hundred twenty-nine".