1155253550 has 72 divisors (see below), whose sum is σ = 2374254288. Its totient is φ = 417894400.

The previous prime is 1155253549. The next prime is 1155253573. The reversal of 1155253550 is 553525511.

It is a super-2 number, since 2×1155253550² = 2669221529575205000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1554479 + ... + 1555221.

It is an arithmetic number, because the mean of its divisors is an integer number (32975754).

Almost surely, 2^1155253550 is an apocalyptic number.

1155253550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1155253550 is an abundant number, since it is smaller than the sum of its proper divisors (1219000738).

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

1155253550 is a wasteful number, since it uses less digits than its factorization.

1155253550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1034 (or 1018 counting only the distinct ones).

The product of its (nonzero) digits is 18750, while the sum is 32.

The square root of 1155253550 is about 33989.0210215005. The cubic root of 1155253550 is about 1049.2825181593.

The spelling of 1155253550 in words is "one billion, one hundred fifty-five million, two hundred fifty-three thousand, five hundred fifty".