87248921 has 2 divisors, whose sum is σ = 87248922. Its totient is φ = 87248920.

The previous prime is 87248899. The next prime is 87248929. The reversal of 87248921 is 12984278.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49561600 + 37687321 = 7040^2 + 6139^2 .

It is a cyclic number.

It is not a de Polignac number, because 87248921 - 2²² = 83054617 is a prime.

It is a super-2 number, since 2×87248921² = 15224748431328482, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (87248929) 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, 43624460 + 43624461.

It is an arithmetic number, because the mean of its divisors is an integer number (43624461).

Almost surely, 2^87248921 is an apocalyptic number.

It is an amenable number.

87248921 is a deficient number, since it is larger than the sum of its proper divisors (1).

87248921 is an equidigital number, since it uses as much as digits as its factorization.

87248921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64512, while the sum is 41.

The square root of 87248921 is about 9340.7130884103. The cubic root of 87248921 is about 443.5269577781.

The spelling of 87248921 in words is "eighty-seven million, two hundred forty-eight thousand, nine hundred twenty-one".