89731513 has 2 divisors, whose sum is σ = 89731514. Its totient is φ = 89731512.

The previous prime is 89731501. The next prime is 89731529. The reversal of 89731513 is 31513798.

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., 68690944 + 21040569 = 8288^2 + 4587^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-89731513 is a prime.

It is not a weakly prime, because it can be changed into another prime (89731573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44865756 + 44865757.

It is an arithmetic number, because the mean of its divisors is an integer number (44865757).

Almost surely, 2^89731513 is an apocalyptic number.

It is an amenable number.

89731513 is a deficient number, since it is larger than the sum of its proper divisors (1).

89731513 is an equidigital number, since it uses as much as digits as its factorization.

89731513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22680, while the sum is 37.

The square root of 89731513 is about 9472.6719039561. The cubic root of 89731513 is about 447.6944015596.

It can be divided in two parts, 8973151 and 3, that multiplied together give a triangular number (26919453 = T₇₃₃₇).

The spelling of 89731513 in words is "eighty-nine million, seven hundred thirty-one thousand, five hundred thirteen".