1211440515 has 16 divisors (see below), whose sum is σ = 1941159168. Its totient is φ = 645150176.

The previous prime is 1211440493. The next prime is 1211440583. The reversal of 1211440515 is 5150441121.

It is a cyclic number.

It is not a de Polignac number, because 1211440515 - 2⁹ = 1211440003 is a prime.

It is a super-3 number, since 3×1211440515³ (a number of 28 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48879 + ... + 69368.

It is an arithmetic number, because the mean of its divisors is an integer number (121322448).

Almost surely, 2^1211440515 is an apocalyptic number.

1211440515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1211440515 is a deficient number, since it is larger than the sum of its proper divisors (729718653).

1211440515 is a wasteful number, since it uses less digits than its factorization.

1211440515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118938.

The product of its (nonzero) digits is 800, while the sum is 24.

The square root of 1211440515 is about 34805.7540501567. The cubic root of 1211440515 is about 1066.0249384908.

Adding to 1211440515 its reverse (5150441121), we get a palindrome (6361881636).

The spelling of 1211440515 in words is "one billion, two hundred eleven million, four hundred forty thousand, five hundred fifteen".