87572129 has 2 divisors, whose sum is σ = 87572130. Its totient is φ = 87572128.

The previous prime is 87572113. The next prime is 87572131. The reversal of 87572129 is 92127578.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87459904 + 112225 = 9352^2 + 335^2 .

It is a cyclic number.

It is not a de Polignac number, because 87572129 - 2⁴ = 87572113 is a prime.

Together with 87572131, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87572029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43786064 + 43786065.

It is an arithmetic number, because the mean of its divisors is an integer number (43786065).

Almost surely, 2^87572129 is an apocalyptic number.

It is an amenable number.

87572129 is a deficient number, since it is larger than the sum of its proper divisors (1).

87572129 is an equidigital number, since it uses as much as digits as its factorization.

87572129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 70560, while the sum is 41.

The square root of 87572129 is about 9357.9981299421. The cubic root of 87572129 is about 444.0739552295.

The spelling of 87572129 in words is "eighty-seven million, five hundred seventy-two thousand, one hundred twenty-nine".