1091620944 has 30 divisors (see below), whose sum is σ = 3055022906. Its totient is φ = 363873600.

The previous prime is 1091620921. The next prime is 1091620951. The reversal of 1091620944 is 4490261901.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 940035600 + 151585344 = 30660^2 + 12312^2 .

It is a super-2 number, since 2×1091620944² = 2383272570758902272, which contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 1091620899 and 1091620908.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3790207 + ... + 3790494.

Almost surely, 2^1091620944 is an apocalyptic number.

It is an amenable number.

1091620944 is an abundant number, since it is smaller than the sum of its proper divisors (1963401962).

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

1091620944 is a wasteful number, since it uses less digits than its factorization.

1091620944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7580715 (or 7580706 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 1091620944 is about 33039.6874077222. The cubic root of 1091620944 is about 1029.6523613936.

The spelling of 1091620944 in words is "one billion, ninety-one million, six hundred twenty thousand, nine hundred forty-four".