1101215540 has 24 divisors (see below), whose sum is σ = 2324542920. Its totient is φ = 438202368.

The previous prime is 1101215527. The next prime is 1101215561. The reversal of 1101215540 is 455121011.

It can be written as a sum of positive squares in 4 ways, for example, as 75550864 + 1025664676 = 8692^2 + 32026^2 .

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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138785 + ... + 146504.

It is an arithmetic number, because the mean of its divisors is an integer number (96855955).

Almost surely, 2^1101215540 is an apocalyptic number.

1101215540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1101215540 is an abundant number, since it is smaller than the sum of its proper divisors (1223327380).

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

1101215540 is a wasteful number, since it uses less digits than its factorization.

1101215540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285491 (or 285489 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 20.

The square root of 1101215540 is about 33184.5677989032. The cubic root of 1101215540 is about 1032.6602111725.

Adding to 1101215540 its reverse (455121011), we get a palindrome (1556336551).

The spelling of 1101215540 in words is "one billion, one hundred one million, two hundred fifteen thousand, five hundred forty".