1231140541511 has 8 divisors (see below), whose sum is σ = 1233153564048. Its totient is φ = 1229127808000.

The previous prime is 1231140541471. The next prime is 1231140541523. The reversal of 1231140541511 is 1151450411321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231140541511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231140541711) 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, 9480641 + ... + 9609621.

It is an arithmetic number, because the mean of its divisors is an integer number (154144195506).

Almost surely, 2^{1231140541511} is an apocalyptic number.

1231140541511 is a deficient number, since it is larger than the sum of its proper divisors (2013022537).

1231140541511 is a wasteful number, since it uses less digits than its factorization.

1231140541511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144513.

The product of its (nonzero) digits is 2400, while the sum is 29.

Adding to 1231140541511 its reverse (1151450411321), we get a palindrome (2382590952832).

The spelling of 1231140541511 in words is "one trillion, two hundred thirty-one billion, one hundred forty million, five hundred forty-one thousand, five hundred eleven".