1255521500 has 24 divisors (see below), whose sum is σ = 2742060048. Its totient is φ = 502208400.

The previous prime is 1255521499. The next prime is 1255521503. The reversal of 1255521500 is 51255521.

It is a self number, because there is not a number n which added to its sum of digits gives 1255521500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1255521503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1255022 + ... + 1256021.

It is an arithmetic number, because the mean of its divisors is an integer number (114252502).

Almost surely, 2^1255521500 is an apocalyptic number.

1255521500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1255521500 is an abundant number, since it is smaller than the sum of its proper divisors (1486538548).

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

1255521500 is a wasteful number, since it uses less digits than its factorization.

1255521500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2511062 (or 2511050 counting only the distinct ones).

The product of its (nonzero) digits is 2500, while the sum is 26.

The square root of 1255521500 is about 35433.3388209466. The cubic root of 1255521500 is about 1078.8011101829.

The spelling of 1255521500 in words is "one billion, two hundred fifty-five million, five hundred twenty-one thousand, five hundred".