88181309 has 2 divisors, whose sum is σ = 88181310. Its totient is φ = 88181308.

The previous prime is 88181297. The next prime is 88181311. The reversal of 88181309 is 90318188.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71453209 + 16728100 = 8453^2 + 4090^2 .

It is a cyclic number.

It is not a de Polignac number, because 88181309 - 2⁴ = 88181293 is a prime.

It is a Sophie Germain prime.

Together with 88181311, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (88181339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44090654 + 44090655.

It is an arithmetic number, because the mean of its divisors is an integer number (44090655).

Almost surely, 2^88181309 is an apocalyptic number.

It is an amenable number.

88181309 is a deficient number, since it is larger than the sum of its proper divisors (1).

88181309 is an equidigital number, since it uses as much as digits as its factorization.

88181309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 38.

The square root of 88181309 is about 9390.4903492842. The cubic root of 88181309 is about 445.1012840196.

The spelling of 88181309 in words is "eighty-eight million, one hundred eighty-one thousand, three hundred nine".