1089072691 has 8 divisors (see below), whose sum is σ = 1247614304. Its totient is φ = 931271040.

The previous prime is 1089072671. The next prime is 1089072697. The reversal of 1089072691 is 1962709801.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1089072691 - 2²³ = 1080684083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1089072697) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 181830 + ... + 187723.

It is an arithmetic number, because the mean of its divisors is an integer number (155951788).

Almost surely, 2^1089072691 is an apocalyptic number.

1089072691 is a deficient number, since it is larger than the sum of its proper divisors (158541613).

1089072691 is an equidigital number, since it uses as much as digits as its factorization.

1089072691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369981.

The product of its (nonzero) digits is 54432, while the sum is 43.

The square root of 1089072691 is about 33001.1013604092. The cubic root of 1089072691 is about 1028.8505387948.

The spelling of 1089072691 in words is "one billion, eighty-nine million, seventy-two thousand, six hundred ninety-one".