1089878729 has 2 divisors, whose sum is σ = 1089878730. Its totient is φ = 1089878728.

The previous prime is 1089878717. The next prime is 1089878743. The reversal of 1089878729 is 9278789801.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 988976704 + 100902025 = 31448^2 + 10045^2 .

It is a cyclic number.

It is not a de Polignac number, because 1089878729 - 2¹² = 1089874633 is a prime.

It is not a weakly prime, because it can be changed into another prime (1089878929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 544939364 + 544939365.

It is an arithmetic number, because the mean of its divisors is an integer number (544939365).

Almost surely, 2^1089878729 is an apocalyptic number.

It is an amenable number.

1089878729 is a deficient number, since it is larger than the sum of its proper divisors (1).

1089878729 is an equidigital number, since it uses as much as digits as its factorization.

1089878729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4064256, while the sum is 59.

The square root of 1089878729 is about 33013.3113910132. The cubic root of 1089878729 is about 1029.1042984477.

The spelling of 1089878729 in words is "one billion, eighty-nine million, eight hundred seventy-eight thousand, seven hundred twenty-nine".