1215041534540 has 24 divisors (see below), whose sum is σ = 2551613369760. Its totient is φ = 486011633408.

The previous prime is 1215041534537. The next prime is 1215041534549. The reversal of 1215041534540 is 454351405121.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1215041534540.

It is not an unprimeable number, because it can be changed into a prime (1215041534549) 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, 2172689 + ... + 2674071.

It is an arithmetic number, because the mean of its divisors is an integer number (106317223740).

Almost surely, 2^{1215041534540} is an apocalyptic number.

1215041534540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1215041534540 is an abundant number, since it is smaller than the sum of its proper divisors (1336571835220).

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

1215041534540 is a wasteful number, since it uses less digits than its factorization.

1215041534540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622561 (or 622559 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 35.

Adding to 1215041534540 its reverse (454351405121), we get a palindrome (1669392939661).

The spelling of 1215041534540 in words is "one trillion, two hundred fifteen billion, forty-one million, five hundred thirty-four thousand, five hundred forty".