1125213520 has 20 divisors (see below), whose sum is σ = 2616121620. Its totient is φ = 450085376.

The previous prime is 1125213517. The next prime is 1125213533. The reversal of 1125213520 is 253125211.

It can be written as a sum of positive squares in 2 ways, for example, as 759333136 + 365880384 = 27556^2 + 19128^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×1125213520² = 2532210931181580800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1125213491 and 1125213500.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7032505 + ... + 7032664.

It is an arithmetic number, because the mean of its divisors is an integer number (130806081).

Almost surely, 2^1125213520 is an apocalyptic number.

1125213520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1125213520 is an abundant number, since it is smaller than the sum of its proper divisors (1490908100).

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

1125213520 is a wasteful number, since it uses less digits than its factorization.

1125213520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14065182 (or 14065176 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 1125213520 is about 33544.2024797132. The cubic root of 1125213520 is about 1040.1077058078.

Adding to 1125213520 its reverse (253125211), we get a palindrome (1378338731).

The spelling of 1125213520 in words is "one billion, one hundred twenty-five million, two hundred thirteen thousand, five hundred twenty".