87722081 has 2 divisors, whose sum is σ = 87722082. Its totient is φ = 87722080.

The previous prime is 87722077. The next prime is 87722093. The reversal of 87722081 is 18022778.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70291456 + 17430625 = 8384^2 + 4175^2 .

It is a cyclic number.

It is not a de Polignac number, because 87722081 - 2² = 87722077 is a prime.

It is a super-2 number, since 2×87722081² = 15390326989941122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (87722381) 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, 43861040 + 43861041.

It is an arithmetic number, because the mean of its divisors is an integer number (43861041).

Almost surely, 2^87722081 is an apocalyptic number.

It is an amenable number.

87722081 is a deficient number, since it is larger than the sum of its proper divisors (1).

87722081 is an equidigital number, since it uses as much as digits as its factorization.

87722081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12544, while the sum is 35.

The square root of 87722081 is about 9366.0066730704. The cubic root of 87722081 is about 444.3272770981.

The spelling of 87722081 in words is "eighty-seven million, seven hundred twenty-two thousand, eighty-one".