1091220948 has 36 divisors (see below), whose sum is σ = 2803588788. Its totient is φ = 357776640.

The previous prime is 1091220943. The next prime is 1091220959. The reversal of 1091220948 is 8490221901.

It can be written as a sum of positive squares in 2 ways, for example, as 563967504 + 527253444 = 23748^2 + 22962^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091220943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 246261 + ... + 250652.

Almost surely, 2^1091220948 is an apocalyptic number.

1091220948 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1091220948 is an abundant number, since it is smaller than the sum of its proper divisors (1712367840).

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

1091220948 is a wasteful number, since it uses less digits than its factorization.

1091220948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 496984 (or 496979 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 1091220948 is about 33033.6335876028. The cubic root of 1091220948 is about 1029.5265829528.

The spelling of 1091220948 in words is "one billion, ninety-one million, two hundred twenty thousand, nine hundred forty-eight".