1061521530 has 64 divisors (see below), whose sum is σ = 2744229888. Its totient is φ = 262025280.

The previous prime is 1061521523. The next prime is 1061521567. The reversal of 1061521530 is 351251601.

It is a super-2 number, since 2×1061521530² = 2253655917307081800, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1061521530.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3424 + ... + 46203.

It is an arithmetic number, because the mean of its divisors is an integer number (42878592).

Almost surely, 2^1061521530 is an apocalyptic number.

1061521530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1061521530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1372114944).

1061521530 is an abundant number, since it is smaller than the sum of its proper divisors (1682708358).

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

1061521530 is a wasteful number, since it uses less digits than its factorization.

1061521530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49691.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 1061521530 is about 32580.9995242626. Note that the first 3 decimals coincide. The cubic root of 1061521530 is about 1020.1004418583.

The spelling of 1061521530 in words is "one billion, sixty-one million, five hundred twenty-one thousand, five hundred thirty".