1089971156 has 6 divisors (see below), whose sum is σ = 1907449530. Its totient is φ = 544985576.

The previous prime is 1089971131. The next prime is 1089971203. The reversal of 1089971156 is 6511799801.

It can be written as a sum of positive squares in only one way, i.e., 1002735556 + 87235600 = 31666^2 + 9340^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1089971156.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 136246391 + ... + 136246398.

It is an arithmetic number, because the mean of its divisors is an integer number (317908255).

Almost surely, 2^1089971156 is an apocalyptic number.

It is an amenable number.

1089971156 is a deficient number, since it is larger than the sum of its proper divisors (817478374).

1089971156 is a wasteful number, since it uses less digits than its factorization.

1089971156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272492793 (or 272492791 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 47.

The square root of 1089971156 is about 33014.7112057640. The cubic root of 1089971156 is about 1029.1333886366.

The spelling of 1089971156 in words is "one billion, eighty-nine million, nine hundred seventy-one thousand, one hundred fifty-six".