89981557 has 2 divisors, whose sum is σ = 89981558. Its totient is φ = 89981556.

The previous prime is 89981533. The next prime is 89981569. The reversal of 89981557 is 75518998.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88378801 + 1602756 = 9401^2 + 1266^2 .

It is a cyclic number.

It is not a de Polignac number, because 89981557 - 2¹¹ = 89979509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (89981057) 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, 44990778 + 44990779.

It is an arithmetic number, because the mean of its divisors is an integer number (44990779).

Almost surely, 2^89981557 is an apocalyptic number.

It is an amenable number.

89981557 is a deficient number, since it is larger than the sum of its proper divisors (1).

89981557 is an equidigital number, since it uses as much as digits as its factorization.

89981557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 907200, while the sum is 52.

The square root of 89981557 is about 9485.8608992542. The cubic root of 89981557 is about 448.1098612505.

The spelling of 89981557 in words is "eighty-nine million, nine hundred eighty-one thousand, five hundred fifty-seven".