1111551320 has 64 divisors (see below), whose sum is σ = 2737463040. Its totient is φ = 402851200.

The previous prime is 1111551313. The next prime is 1111551347. The reversal of 1111551320 is 231551111.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1111551292 and 1111551301.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 132779 + ... + 140901.

It is an arithmetic number, because the mean of its divisors is an integer number (42772860).

Almost surely, 2^1111551320 is an apocalyptic number.

1111551320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1111551320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1368731520).

1111551320 is an abundant number, since it is smaller than the sum of its proper divisors (1625911720).

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

1111551320 is a wasteful number, since it uses less digits than its factorization.

1111551320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8456 (or 8452 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 20.

The square root of 1111551320 is about 33339.9358127756. The cubic root of 1111551320 is about 1035.8809337282.

The spelling of 1111551320 in words is "one billion, one hundred eleven million, five hundred fifty-one thousand, three hundred twenty".