1242055511 has 4 divisors (see below), whose sum is σ = 1268482272. Its totient is φ = 1215628752.

The previous prime is 1242055501. The next prime is 1242055519. The reversal of 1242055511 is 1155502421.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1242055511 is a prime.

It is a super-3 number, since 3×1242055511³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242055519) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13213310 + ... + 13213403.

It is an arithmetic number, because the mean of its divisors is an integer number (317120568).

Almost surely, 2^1242055511 is an apocalyptic number.

1242055511 is a deficient number, since it is larger than the sum of its proper divisors (26426761).

1242055511 is an equidigital number, since it uses as much as digits as its factorization.

1242055511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26426760.

The product of its (nonzero) digits is 2000, while the sum is 26.

The square root of 1242055511 is about 35242.8079329670. The cubic root of 1242055511 is about 1074.9303754438.

Adding to 1242055511 its reverse (1155502421), we get a palindrome (2397557932).

The spelling of 1242055511 in words is "one billion, two hundred forty-two million, fifty-five thousand, five hundred eleven".