87002921 has 2 divisors, whose sum is σ = 87002922. Its totient is φ = 87002920.

The previous prime is 87002893. The next prime is 87002941. The reversal of 87002921 is 12920078.

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., 83539600 + 3463321 = 9140^2 + 1861^2 .

It is a cyclic number.

It is not a de Polignac number, because 87002921 - 2⁶ = 87002857 is a prime.

It is not a weakly prime, because it can be changed into another prime (87002941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43501460 + 43501461.

It is an arithmetic number, because the mean of its divisors is an integer number (43501461).

Almost surely, 2^87002921 is an apocalyptic number.

It is an amenable number.

87002921 is a deficient number, since it is larger than the sum of its proper divisors (1).

87002921 is an equidigital number, since it uses as much as digits as its factorization.

87002921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 87002921 is about 9327.5356338103. The cubic root of 87002921 is about 443.1097211522.

Adding to 87002921 its reverse (12920078), we get a palindrome (99922999).

The spelling of 87002921 in words is "eighty-seven million, two thousand, nine hundred twenty-one".