87128501 has 2 divisors, whose sum is σ = 87128502. Its totient is φ = 87128500.

The previous prime is 87128473. The next prime is 87128521. The reversal of 87128501 is 10582178.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81884401 + 5244100 = 9049^2 + 2290^2 .

It is a cyclic number.

It is not a de Polignac number, because 87128501 - 2¹⁴ = 87112117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87128521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43564250 + 43564251.

It is an arithmetic number, because the mean of its divisors is an integer number (43564251).

Almost surely, 2^87128501 is an apocalyptic number.

It is an amenable number.

87128501 is a deficient number, since it is larger than the sum of its proper divisors (1).

87128501 is an equidigital number, since it uses as much as digits as its factorization.

87128501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4480, while the sum is 32.

The square root of 87128501 is about 9334.2648880348. The cubic root of 87128501 is about 443.3228134890.

The spelling of 87128501 in words is "eighty-seven million, one hundred twenty-eight thousand, five hundred one".