1155551520 has 48 divisors (see below), whose sum is σ = 3639988800. Its totient is φ = 308146944.

The previous prime is 1155551491. The next prime is 1155551531. The reversal of 1155551520 is 251555511.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1203220 + ... + 1204179.

It is an arithmetic number, because the mean of its divisors is an integer number (75833100).

Almost surely, 2^1155551520 is an apocalyptic number.

1155551520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1155551520 is an abundant number, since it is smaller than the sum of its proper divisors (2484437280).

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

1155551520 is a wasteful number, since it uses less digits than its factorization.

1155551520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2407417 (or 2407409 counting only the distinct ones).

The product of its (nonzero) digits is 6250, while the sum is 30.

The square root of 1155551520 is about 33993.4040660832. The cubic root of 1155551520 is about 1049.3727228406.

The spelling of 1155551520 in words is "one billion, one hundred fifty-five million, five hundred fifty-one thousand, five hundred twenty".