88721917 has 2 divisors, whose sum is σ = 88721918. Its totient is φ = 88721916.

The previous prime is 88721911. The next prime is 88721921. The reversal of 88721917 is 71912788.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88717561 + 4356 = 9419^2 + 66^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-88721917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (88721911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44360958 + 44360959.

It is an arithmetic number, because the mean of its divisors is an integer number (44360959).

Almost surely, 2^88721917 is an apocalyptic number.

It is an amenable number.

88721917 is a deficient number, since it is larger than the sum of its proper divisors (1).

88721917 is an equidigital number, since it uses as much as digits as its factorization.

88721917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56448, while the sum is 43.

The square root of 88721917 is about 9419.2312319000. The cubic root of 88721917 is about 446.0090170243.

The spelling of 88721917 in words is "eighty-eight million, seven hundred twenty-one thousand, nine hundred seventeen".