1131521420 has 48 divisors (see below), whose sum is σ = 2524616640. Its totient is φ = 425182464.

The previous prime is 1131521407. The next prime is 1131521423. The reversal of 1131521420 is 241251311.

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

It is a junction number, because it is equal to n+sod(n) for n = 1131521392 and 1131521401.

It is not an unprimeable number, because it can be changed into a prime (1131521423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4904 + ... + 47823.

It is an arithmetic number, because the mean of its divisors is an integer number (52596180).

Almost surely, 2^1131521420 is an apocalyptic number.

1131521420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1131521420 is an abundant number, since it is smaller than the sum of its proper divisors (1393095220).

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

1131521420 is a wasteful number, since it uses less digits than its factorization.

1131521420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52802 (or 52800 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 1131521420 is about 33638.0947736343. The cubic root of 1131521420 is about 1042.0476852833.

Adding to 1131521420 its reverse (241251311), we get a palindrome (1372772731).

The spelling of 1131521420 in words is "one billion, one hundred thirty-one million, five hundred twenty-one thousand, four hundred twenty".