8587492721 has 2 divisors, whose sum is σ = 8587492722. Its totient is φ = 8587492720.

The previous prime is 8587492663. The next prime is 8587492747. The reversal of 8587492721 is 1272947858.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8507479696 + 80013025 = 92236^2 + 8945^2 .

It is a cyclic number.

It is not a de Polignac number, because 8587492721 - 2¹⁸ = 8587230577 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (8587452721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4293746360 + 4293746361.

It is an arithmetic number, because the mean of its divisors is an integer number (4293746361).

Almost surely, 2^8587492721 is an apocalyptic number.

It is an amenable number.

8587492721 is a deficient number, since it is larger than the sum of its proper divisors (1).

8587492721 is an equidigital number, since it uses as much as digits as its factorization.

8587492721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2257920, while the sum is 53.

The square root of 8587492721 is about 92668.7256899543. The cubic root of 8587492721 is about 2047.8059191369.

The spelling of 8587492721 in words is "eight billion, five hundred eighty-seven million, four hundred ninety-two thousand, seven hundred twenty-one".