88391609 has 2 divisors, whose sum is σ = 88391610. Its totient is φ = 88391608.

The previous prime is 88391603. The next prime is 88391647. The reversal of 88391609 is 90619388.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63361600 + 25030009 = 7960^2 + 5003^2 .

It is a cyclic number.

It is not a de Polignac number, because 88391609 - 2⁸ = 88391353 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 88391609.

It is not a weakly prime, because it can be changed into another prime (88391603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44195804 + 44195805.

It is an arithmetic number, because the mean of its divisors is an integer number (44195805).

Almost surely, 2^88391609 is an apocalyptic number.

It is an amenable number.

88391609 is a deficient number, since it is larger than the sum of its proper divisors (1).

88391609 is an equidigital number, since it uses as much as digits as its factorization.

88391609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 88391609 is about 9401.6811794487. The cubic root of 88391609 is about 445.4548377303.

The spelling of 88391609 in words is "eighty-eight million, three hundred ninety-one thousand, six hundred nine".