1155531630 has 32 divisors (see below), whose sum is σ = 3025392768. Its totient is φ = 280128800.

The previous prime is 1155531557. The next prime is 1155531649. The reversal of 1155531630 is 361355511.

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

It is a congruent number.

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, 1750476 + ... + 1751135.

It is an arithmetic number, because the mean of its divisors is an integer number (94543524).

Almost surely, 2^1155531630 is an apocalyptic number.

1155531630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1155531630 is an abundant number, since it is smaller than the sum of its proper divisors (1869861138).

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

1155531630 is a wasteful number, since it uses less digits than its factorization.

1155531630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3501632.

The product of its (nonzero) digits is 6750, while the sum is 30.

The square root of 1155531630 is about 33993.1115080688. Note that the first 3 decimals coincide. The cubic root of 1155531630 is about 1049.3667020091.

The spelling of 1155531630 in words is "one billion, one hundred fifty-five million, five hundred thirty-one thousand, six hundred thirty".