88312981 has 2 divisors, whose sum is σ = 88312982. Its totient is φ = 88312980.

The previous prime is 88312979. The next prime is 88313021. The reversal of 88312981 is 18921388.

It is an a-pointer prime, because the next prime (88313021) can be obtained adding 88312981 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51710481 + 36602500 = 7191^2 + 6050^2 .

It is a cyclic number.

It is not a de Polignac number, because 88312981 - 2¹ = 88312979 is a prime.

It is a super-2 number, since 2×88312981² = 15598365226212722, which contains 22 as substring.

Together with 88312979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (88312181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44156490 + 44156491.

It is an arithmetic number, because the mean of its divisors is an integer number (44156491).

Almost surely, 2^88312981 is an apocalyptic number.

88312981 is the 5944-th centered pentagonal number.

It is an amenable number.

88312981 is a deficient number, since it is larger than the sum of its proper divisors (1).

88312981 is an equidigital number, since it uses as much as digits as its factorization.

88312981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 40.

The square root of 88312981 is about 9397.4986565575. The cubic root of 88312981 is about 445.3227150323.

The spelling of 88312981 in words is "eighty-eight million, three hundred twelve thousand, nine hundred eighty-one".