88821661 has 2 divisors, whose sum is σ = 88821662. Its totient is φ = 88821660.

The previous prime is 88821659. The next prime is 88821671. The reversal of 88821661 is 16612888.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67338436 + 21483225 = 8206^2 + 4635^2 .

It is a cyclic number.

It is not a de Polignac number, because 88821661 - 2¹ = 88821659 is a prime.

Together with 88821659, 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 (88821611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44410830 + 44410831.

It is an arithmetic number, because the mean of its divisors is an integer number (44410831).

Almost surely, 2^88821661 is an apocalyptic number.

It is an amenable number.

88821661 is a deficient number, since it is larger than the sum of its proper divisors (1).

88821661 is an equidigital number, since it uses as much as digits as its factorization.

88821661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36864, while the sum is 40.

The square root of 88821661 is about 9424.5244442359. The cubic root of 88821661 is about 446.1760936016.

The spelling of 88821661 in words is "eighty-eight million, eight hundred twenty-one thousand, six hundred sixty-one".