1091010920 has 16 divisors (see below), whose sum is σ = 2454774660. Its totient is φ = 436404352.

The previous prime is 1091010919. The next prime is 1091010961. The reversal of 1091010920 is 290101901.

It can be written as a sum of positive squares in 2 ways, for example, as 885776644 + 205234276 = 29762^2 + 14326^2 .

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, 13637597 + ... + 13637676.

Almost surely, 2^1091010920 is an apocalyptic number.

1091010920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1091010920 is an abundant number, since it is smaller than the sum of its proper divisors (1363763740).

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

1091010920 is a wasteful number, since it uses less digits than its factorization.

1091010920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27275284 (or 27275280 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 23.

The square root of 1091010920 is about 33030.4544322357. The cubic root of 1091010920 is about 1029.4605274995.

The spelling of 1091010920 in words is "one billion, ninety-one million, ten thousand, nine hundred twenty".