87388991 has 2 divisors, whose sum is σ = 87388992. Its totient is φ = 87388990.

The previous prime is 87388981. The next prime is 87389023. The reversal of 87388991 is 19988378.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87388991 - 2⁶ = 87388927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87388981) 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, 43694495 + 43694496.

It is an arithmetic number, because the mean of its divisors is an integer number (43694496).

Almost surely, 2^87388991 is an apocalyptic number.

87388991 is a deficient number, since it is larger than the sum of its proper divisors (1).

87388991 is an equidigital number, since it uses as much as digits as its factorization.

87388991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 870912, while the sum is 53.

The square root of 87388991 is about 9348.2079031224. The cubic root of 87388991 is about 443.7641779243.

The spelling of 87388991 in words is "eighty-seven million, three hundred eighty-eight thousand, nine hundred ninety-one".