87388909 has 2 divisors, whose sum is σ = 87388910. Its totient is φ = 87388908.

The previous prime is 87388877. The next prime is 87388927. The reversal of 87388909 is 90988378.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87366409 + 22500 = 9347^2 + 150^2 .

It is a cyclic number.

It is not a de Polignac number, because 87388909 - 2⁵ = 87388877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87388409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43694454 + 43694455.

It is an arithmetic number, because the mean of its divisors is an integer number (43694455).

Almost surely, 2^87388909 is an apocalyptic number.

It is an amenable number.

87388909 is a deficient number, since it is larger than the sum of its proper divisors (1).

87388909 is an equidigital number, since it uses as much as digits as its factorization.

87388909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 870912, while the sum is 52.

The square root of 87388909 is about 9348.2035172540. The cubic root of 87388909 is about 443.7640391247.

The spelling of 87388909 in words is "eighty-seven million, three hundred eighty-eight thousand, nine hundred nine".