1155204550 has 24 divisors (see below), whose sum is σ = 2164377096. Its totient is φ = 458706240.

The previous prime is 1155204539. The next prime is 1155204581. The reversal of 1155204550 is 554025511.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 77472 + ... + 91171.

It is an arithmetic number, because the mean of its divisors is an integer number (90182379).

Almost surely, 2^1155204550 is an apocalyptic number.

1155204550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1155204550 is a deficient number, since it is larger than the sum of its proper divisors (1009172546).

1155204550 is a wasteful number, since it uses less digits than its factorization.

1155204550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168792 (or 168787 counting only the distinct ones).

The product of its (nonzero) digits is 5000, while the sum is 28.

The square root of 1155204550 is about 33988.3001928605. The cubic root of 1155204550 is about 1049.2676828675.

The spelling of 1155204550 in words is "one billion, one hundred fifty-five million, two hundred four thousand, five hundred fifty".