87187501 has 2 divisors, whose sum is σ = 87187502. Its totient is φ = 87187500.

The previous prime is 87187493. The next prime is 87187537. The reversal of 87187501 is 10578178.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81180100 + 6007401 = 9010^2 + 2451^2 .

It is a cyclic number.

It is not a de Polignac number, because 87187501 - 2³ = 87187493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87187591) 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, 43593750 + 43593751.

It is an arithmetic number, because the mean of its divisors is an integer number (43593751).

Almost surely, 2^87187501 is an apocalyptic number.

It is an amenable number.

87187501 is a deficient number, since it is larger than the sum of its proper divisors (1).

87187501 is an equidigital number, since it uses as much as digits as its factorization.

87187501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15680, while the sum is 37.

The square root of 87187501 is about 9337.4247520395. The cubic root of 87187501 is about 443.4228578448.

The spelling of 87187501 in words is "eighty-seven million, one hundred eighty-seven thousand, five hundred one".