89121569 has 2 divisors, whose sum is σ = 89121570. Its totient is φ = 89121568.

The previous prime is 89121551. The next prime is 89121607. The reversal of 89121569 is 96512198.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78145600 + 10975969 = 8840^2 + 3313^2 .

It is a cyclic number.

It is not a de Polignac number, because 89121569 - 2¹² = 89117473 is a prime.

It is a super-2 number, since 2×89121569² = 15885308122043522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (89121269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44560784 + 44560785.

It is an arithmetic number, because the mean of its divisors is an integer number (44560785).

Almost surely, 2^89121569 is an apocalyptic number.

It is an amenable number.

89121569 is a deficient number, since it is larger than the sum of its proper divisors (1).

89121569 is an equidigital number, since it uses as much as digits as its factorization.

89121569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 41.

The square root of 89121569 is about 9440.4220774285. The cubic root of 89121569 is about 446.6777034351.

The spelling of 89121569 in words is "eighty-nine million, one hundred twenty-one thousand, five hundred sixty-nine".