87881501 has 2 divisors, whose sum is σ = 87881502. Its totient is φ = 87881500.

The previous prime is 87881489. The next prime is 87881509. The reversal of 87881501 is 10518878.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68079001 + 19802500 = 8251^2 + 4450^2 .

It is a cyclic number.

It is not a de Polignac number, because 87881501 - 2¹⁰ = 87880477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87881509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43940750 + 43940751.

It is an arithmetic number, because the mean of its divisors is an integer number (43940751).

Almost surely, 2^87881501 is an apocalyptic number.

It is an amenable number.

87881501 is a deficient number, since it is larger than the sum of its proper divisors (1).

87881501 is an equidigital number, since it uses as much as digits as its factorization.

87881501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17920, while the sum is 38.

The square root of 87881501 is about 9374.5133740371. The cubic root of 87881501 is about 444.5962773581.

The spelling of 87881501 in words is "eighty-seven million, eight hundred eighty-one thousand, five hundred one".