87382991 has 2 divisors, whose sum is σ = 87382992. Its totient is φ = 87382990.

The previous prime is 87382979. The next prime is 87383029. The reversal of 87382991 is 19928378.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87382991 - 2¹⁴ = 87366607 is a prime.

It is a super-2 number, since 2×87382991² = 15271574232212162, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87382901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43691495 + 43691496.

It is an arithmetic number, because the mean of its divisors is an integer number (43691496).

Almost surely, 2^87382991 is an apocalyptic number.

87382991 is a deficient number, since it is larger than the sum of its proper divisors (1).

87382991 is an equidigital number, since it uses as much as digits as its factorization.

87382991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 47.

The square root of 87382991 is about 9347.8869804892. The cubic root of 87382991 is about 443.7540216259.

The spelling of 87382991 in words is "eighty-seven million, three hundred eighty-two thousand, nine hundred ninety-one".