88165981 has 8 divisors (see below), whose sum is σ = 89364600. Its totient is φ = 86972160.

The previous prime is 88165943. The next prime is 88165991. The reversal of 88165981 is 18956188.

It can be written as a sum of positive squares in 4 ways, for example, as 9400356 + 78765625 = 3066^2 + 8875^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 88165981 - 2⁷ = 88165853 is a prime.

It is a super-2 number, since 2×88165981² = 15546480411384722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (88165991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49771 + ... + 51511.

It is an arithmetic number, because the mean of its divisors is an integer number (11170575).

Almost surely, 2^88165981 is an apocalyptic number.

It is an amenable number.

88165981 is a deficient number, since it is larger than the sum of its proper divisors (1198619).

88165981 is a wasteful number, since it uses less digits than its factorization.

88165981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2399.

The product of its digits is 138240, while the sum is 46.

The square root of 88165981 is about 9389.6741690008. The cubic root of 88165981 is about 445.0754928101.

The spelling of 88165981 in words is "eighty-eight million, one hundred sixty-five thousand, nine hundred eighty-one".