88888981 has 2 divisors, whose sum is σ = 88888982. Its totient is φ = 88888980.

The previous prime is 88888939. The next prime is 88888999. The reversal of 88888981 is 18988888.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75864100 + 13024881 = 8710^2 + 3609^2 .

It is a cyclic number.

It is not a de Polignac number, because 88888981 - 2¹³ = 88880789 is a prime.

It is a super-2 number, since 2×88888981² = 15802501886436722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (88888901) 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 as a sum of consecutive naturals, namely, 44444490 + 44444491.

It is an arithmetic number, because the mean of its divisors is an integer number (44444491).

Almost surely, 2^88888981 is an apocalyptic number.

It is an amenable number.

88888981 is a deficient number, since it is larger than the sum of its proper divisors (1).

88888981 is an equidigital number, since it uses as much as digits as its factorization.

88888981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2359296, while the sum is 58.

The square root of 88888981 is about 9428.0953007487. The cubic root of 88888981 is about 446.2887875436.

The spelling of 88888981 in words is "eighty-eight million, eight hundred eighty-eight thousand, nine hundred eighty-one".