1145121540 has 24 divisors (see below), whose sum is σ = 3206340480. Its totient is φ = 305365728.

The previous prime is 1145121529. The next prime is 1145121541. The reversal of 1145121540 is 451215411.

It is a super-2 number, since 2×1145121540² = 2622606682743943200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1145121540.

It is not an unprimeable number, because it can be changed into a prime (1145121541) 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, 9542620 + ... + 9542739.

It is an arithmetic number, because the mean of its divisors is an integer number (133597520).

Almost surely, 2^1145121540 is an apocalyptic number.

1145121540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1145121540 is an abundant number, since it is smaller than the sum of its proper divisors (2061218940).

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

1145121540 is a wasteful number, since it uses less digits than its factorization.

1145121540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19085371 (or 19085369 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 24.

The square root of 1145121540 is about 33839.6445016788. The cubic root of 1145121540 is about 1046.2059717201.

Adding to 1145121540 its reverse (451215411), we get a palindrome (1596336951).

It can be divided in two parts, 1 and 145121540, that added together give a palindrome (145121541).

The spelling of 1145121540 in words is "one billion, one hundred forty-five million, one hundred twenty-one thousand, five hundred forty".