1211161341511 has 8 divisors (see below), whose sum is σ = 1336112614800. Its totient is φ = 1088684351040.

The previous prime is 1211161341491. The next prime is 1211161341517. The reversal of 1211161341511 is 1151431611121.

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

It is not a de Polignac number, because 1211161341511 - 2¹¹ = 1211161339463 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1211161341511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211161341517) 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, 618569676 + ... + 618571633.

It is an arithmetic number, because the mean of its divisors is an integer number (167014076850).

Almost surely, 2^{1211161341511} is an apocalyptic number.

1211161341511 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1211161341511 is a deficient number, since it is larger than the sum of its proper divisors (124951273289).

1211161341511 is a wasteful number, since it uses less digits than its factorization.

1211161341511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1237141409.

The product of its digits is 720, while the sum is 28.

Adding to 1211161341511 its reverse (1151431611121), we get a palindrome (2362592952632).

The spelling of 1211161341511 in words is "one trillion, two hundred eleven billion, one hundred sixty-one million, three hundred forty-one thousand, five hundred eleven".