1011156500 has 48 divisors (see below), whose sum is σ = 2220765456. Its totient is φ = 402192000.

The previous prime is 1011156491. The next prime is 1011156533. The reversal of 1011156500 is 56511101.

It can be written as a sum of positive squares in 8 ways, for example, as 680062084 + 331094416 = 26078^2 + 18196^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

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 15 ways as a sum of consecutive naturals, for example, 84914 + ... + 96086.

It is an arithmetic number, because the mean of its divisors is an integer number (46265947).

Almost surely, 2^1011156500 is an apocalyptic number.

1011156500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1011156500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1110382728).

1011156500 is an abundant number, since it is smaller than the sum of its proper divisors (1209608956).

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

1011156500 is a wasteful number, since it uses less digits than its factorization.

1011156500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11373 (or 11361 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 20.

The square root of 1011156500 is about 31798.6870798151. The cubic root of 1011156500 is about 1003.7050886970.

Adding to 1011156500 its reverse (56511101), we get a palindrome (1067667601).

The spelling of 1011156500 in words is "one billion, eleven million, one hundred fifty-six thousand, five hundred".