1152121520 has 80 divisors (see below), whose sum is σ = 3049304832. Its totient is φ = 400730880.

The previous prime is 1152121517. The next prime is 1152121549. The reversal of 1152121520 is 251212511.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×1152121520² = 2654767993694220800, which contains 22 as substring.

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 = 1152121492 and 1152121501.

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, 8222 + ... + 48701.

Almost surely, 2^1152121520 is an apocalyptic number.

1152121520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1152121520 is an abundant number, since it is smaller than the sum of its proper divisors (1897183312).

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

1152121520 is a wasteful number, since it uses less digits than its factorization.

1152121520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56970 (or 56964 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 20.

The square root of 1152121520 is about 33942.9156084153. The cubic root of 1152121520 is about 1048.3334166299. Note that the first 3 decimals are identical.

Subtracting from 1152121520 its reverse (251212511), we obtain a palindrome (900909009).

The spelling of 1152121520 in words is "one billion, one hundred fifty-two million, one hundred twenty-one thousand, five hundred twenty".