89138729 has 2 divisors, whose sum is σ = 89138730. Its totient is φ = 89138728.

The previous prime is 89138723. The next prime is 89138741. The reversal of 89138729 is 92783198.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 88868329 + 270400 = 9427^2 + 520^2 .

It is a cyclic number.

It is not a de Polignac number, because 89138729 - 2⁴ = 89138713 is a prime.

It is not a weakly prime, because it can be changed into another prime (89138723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44569364 + 44569365.

It is an arithmetic number, because the mean of its divisors is an integer number (44569365).

Almost surely, 2^89138729 is an apocalyptic number.

It is an amenable number.

89138729 is a deficient number, since it is larger than the sum of its proper divisors (1).

89138729 is an equidigital number, since it uses as much as digits as its factorization.

89138729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 47.

The square root of 89138729 is about 9441.3308913521. The cubic root of 89138729 is about 446.7063702609.

The spelling of 89138729 in words is "eighty-nine million, one hundred thirty-eight thousand, seven hundred twenty-nine".