1215005512311 has 24 divisors (see below), whose sum is σ = 1793746356480. Its totient is φ = 792151297296.

The previous prime is 1215005512261. The next prime is 1215005512339. The reversal of 1215005512311 is 1132155005121.

It is a happy number.

1215005512311 is a `hidden beast` number, since 1 + 21 + 500 + 5 + 5 + 123 + 11 = 666.

It is not a de Polignac number, because 1215005512311 - 2⁷ = 1215005512183 is a prime.

It is a super-2 number, since 2×1215005512311² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215005510311) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 576681 + ... + 1662098.

It is an arithmetic number, because the mean of its divisors is an integer number (74739431520).

Almost surely, 2^{1215005512311} is an apocalyptic number.

1215005512311 is a deficient number, since it is larger than the sum of its proper divisors (578740844169).

1215005512311 is a wasteful number, since it uses less digits than its factorization.

1215005512311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2240115 (or 2240112 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 27.

The spelling of 1215005512311 in words is "one trillion, two hundred fifteen billion, five million, five hundred twelve thousand, three hundred eleven".