1151312020 has 24 divisors (see below), whose sum is σ = 2419437384. Its totient is φ = 460204416.

The previous prime is 1151311999. The next prime is 1151312027. The reversal of 1151312020 is 202131511.

It can be written as a sum of positive squares in 4 ways, for example, as 211644304 + 939667716 = 14548^2 + 30654^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1151311985 and 1151312003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1151312027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10582 + ... + 49138.

It is an arithmetic number, because the mean of its divisors is an integer number (100809891).

Almost surely, 2^1151312020 is an apocalyptic number.

1151312020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1151312020 is an abundant number, since it is smaller than the sum of its proper divisors (1268125364).

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

1151312020 is a wasteful number, since it uses less digits than its factorization.

1151312020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40059 (or 40057 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 1151312020 is about 33930.9890807798. The cubic root of 1151312020 is about 1048.0878335276.

Adding to 1151312020 its reverse (202131511), we get a palindrome (1353443531).

The spelling of 1151312020 in words is "one billion, one hundred fifty-one million, three hundred twelve thousand, twenty".