1091207748 has 12 divisors (see below), whose sum is σ = 2546151440. Its totient is φ = 363735912.

The previous prime is 1091207687. The next prime is 1091207771. The reversal of 1091207748 is 8477021901.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45466978 + ... + 45467001.

Almost surely, 2^1091207748 is an apocalyptic number.

It is an amenable number.

1091207748 is an abundant number, since it is smaller than the sum of its proper divisors (1454943692).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1091207748 is a wasteful number, since it uses less digits than its factorization.

1091207748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90933986 (or 90933984 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 39.

The square root of 1091207748 is about 33033.4337906310. The cubic root of 1091207748 is about 1029.5224316989.

The spelling of 1091207748 in words is "one billion, ninety-one million, two hundred seven thousand, seven hundred forty-eight".