1213315511 has 2 divisors, whose sum is σ = 1213315512. Its totient is φ = 1213315510.

The previous prime is 1213315457. The next prime is 1213315561. The reversal of 1213315511 is 1155133121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1213315511 - 2⁶ = 1213315447 is a prime.

It is a super-3 number, since 3×1213315511³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1213315561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606657755 + 606657756.

It is an arithmetic number, because the mean of its divisors is an integer number (606657756).

Almost surely, 2^1213315511 is an apocalyptic number.

1213315511 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213315511 is an equidigital number, since it uses as much as digits as its factorization.

1213315511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 450, while the sum is 23.

The square root of 1213315511 is about 34832.6787801340. The cubic root of 1213315511 is about 1066.5746317836.

Adding to 1213315511 its reverse (1155133121), we get a palindrome (2368448632).

The spelling of 1213315511 in words is "one billion, two hundred thirteen million, three hundred fifteen thousand, five hundred eleven".