89780731693 has 2 divisors, whose sum is σ = 89780731694. Its totient is φ = 89780731692.

The previous prime is 89780731681. The next prime is 89780731709. The reversal of 89780731693 is 39613708798.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89273671369 + 507060324 = 298787^2 + 22518^2 .

It is a cyclic number.

It is not a de Polignac number, because 89780731693 - 2²⁹ = 89243860781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (89780711693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44890365846 + 44890365847.

It is an arithmetic number, because the mean of its divisors is an integer number (44890365847).

Almost surely, 2^89780731693 is an apocalyptic number.

It is an amenable number.

89780731693 is a deficient number, since it is larger than the sum of its proper divisors (1).

89780731693 is an equidigital number, since it uses as much as digits as its factorization.

89780731693 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13716864, while the sum is 61.

The spelling of 89780731693 in words is "eighty-nine billion, seven hundred eighty million, seven hundred thirty-one thousand, six hundred ninety-three".