1131545420 has 24 divisors (see below), whose sum is σ = 2399776848. Its totient is φ = 448136000.

The previous prime is 1131545411. The next prime is 1131545423. The reversal of 1131545420 is 245451311.

It is a self number, because there is not a number n which added to its sum of digits gives 1131545420.

It is not an unprimeable number, because it can be changed into a prime (1131545423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 278066 + ... + 282105.

It is an arithmetic number, because the mean of its divisors is an integer number (99990702).

Almost surely, 2^1131545420 is an apocalyptic number.

1131545420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1131545420 is an abundant number, since it is smaller than the sum of its proper divisors (1268231428).

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

1131545420 is a wasteful number, since it uses less digits than its factorization.

1131545420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560281 (or 560279 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 1131545420 is about 33638.4515101394. The cubic root of 1131545420 is about 1042.0550526405.

Adding to 1131545420 its reverse (245451311), we get a palindrome (1376996731).

The spelling of 1131545420 in words is "one billion, one hundred thirty-one million, five hundred forty-five thousand, four hundred twenty".