87031501 has 2 divisors, whose sum is σ = 87031502. Its totient is φ = 87031500.

The previous prime is 87031493. The next prime is 87031513. The reversal of 87031501 is 10513078.

87031501 is nontrivially palindromic in base 8.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53275401 + 33756100 = 7299^2 + 5810^2 .

It is a cyclic number.

It is not a de Polignac number, because 87031501 - 2³ = 87031493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87031591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43515750 + 43515751.

It is an arithmetic number, because the mean of its divisors is an integer number (43515751).

Almost surely, 2^87031501 is an apocalyptic number.

It is an amenable number.

87031501 is a deficient number, since it is larger than the sum of its proper divisors (1).

87031501 is an equidigital number, since it uses as much as digits as its factorization.

87031501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 87031501 is about 9329.0675311094. The cubic root of 87031501 is about 443.1582355747.

Adding to 87031501 its reverse (10513078), we get a palindrome (97544579).

The spelling of 87031501 in words is "eighty-seven million, thirty-one thousand, five hundred one".