88187989 has 2 divisors, whose sum is σ = 88187990. Its totient is φ = 88187988.

The previous prime is 88187977. The next prime is 88188029. The reversal of 88187989 is 98978188.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56175025 + 32012964 = 7495^2 + 5658^2 .

It is a cyclic number.

It is not a de Polignac number, because 88187989 - 2¹³ = 88179797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (88187089) 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, 44093994 + 44093995.

It is an arithmetic number, because the mean of its divisors is an integer number (44093995).

Almost surely, 2^88187989 is an apocalyptic number.

It is an amenable number.

88187989 is a deficient number, since it is larger than the sum of its proper divisors (1).

88187989 is an equidigital number, since it uses as much as digits as its factorization.

88187989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2322432, while the sum is 58.

The square root of 88187989 is about 9390.8460215254. The cubic root of 88187989 is about 445.1125229905.

It can be divided in two parts, 8818 and 7989, that added together give a 5-th power (16807 = 7⁵).

The spelling of 88187989 in words is "eighty-eight million, one hundred eighty-seven thousand, nine hundred eighty-nine".