201311215511 has 8 divisors (see below), whose sum is σ = 230082357120. Its totient is φ = 172543173048.

The previous prime is 201311215481. The next prime is 201311215517. The reversal of 201311215511 is 115512113102.

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

It is a cyclic number.

It is not a de Polignac number, because 201311215511 - 2²² = 201307021207 is a prime.

It is a super-2 number, since 2×201311215511² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201311215517) 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, 633881 + ... + 896898.

It is an arithmetic number, because the mean of its divisors is an integer number (28760294640).

Almost surely, 2^201311215511 is an apocalyptic number.

201311215511 is a deficient number, since it is larger than the sum of its proper divisors (28771141609).

201311215511 is a wasteful number, since it uses less digits than its factorization.

201311215511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1549573.

The product of its (nonzero) digits is 300, while the sum is 23.

Adding to 201311215511 its reverse (115512113102), we get a palindrome (316823328613).

The spelling of 201311215511 in words is "two hundred one billion, three hundred eleven million, two hundred fifteen thousand, five hundred eleven".