88138993 has 2 divisors, whose sum is σ = 88138994. Its totient is φ = 88138992.

The previous prime is 88138991. The next prime is 88139017. The reversal of 88138993 is 39983188.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67043344 + 21095649 = 8188^2 + 4593^2 .

It is a cyclic number.

It is not a de Polignac number, because 88138993 - 2¹ = 88138991 is a prime.

Together with 88138991, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (88138991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44069496 + 44069497.

It is an arithmetic number, because the mean of its divisors is an integer number (44069497).

Almost surely, 2^88138993 is an apocalyptic number.

It is an amenable number.

88138993 is a deficient number, since it is larger than the sum of its proper divisors (1).

88138993 is an equidigital number, since it uses as much as digits as its factorization.

88138993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 373248, while the sum is 49.

The square root of 88138993 is about 9388.2369484371. The cubic root of 88138993 is about 445.0300749778.

The spelling of 88138993 in words is "eighty-eight million, one hundred thirty-eight thousand, nine hundred ninety-three".