1551112241111 has 4 divisors (see below), whose sum is σ = 1618551903792. Its totient is φ = 1483672578432.

The previous prime is 1551112241101. The next prime is 1551112241117. The reversal of 1551112241111 is 1111422111551.

It is a happy number.

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-1551112241111 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1551112241117) 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, 33719831306 + ... + 33719831351.

It is an arithmetic number, because the mean of its divisors is an integer number (404637975948).

Almost surely, 2^{1551112241111} is an apocalyptic number.

1551112241111 is a deficient number, since it is larger than the sum of its proper divisors (67439662681).

1551112241111 is an equidigital number, since it uses as much as digits as its factorization.

1551112241111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67439662680.

The product of its digits is 400, while the sum is 26.

Adding to 1551112241111 its reverse (1111422111551), we get a palindrome (2662534352662).

The spelling of 1551112241111 in words is "one trillion, five hundred fifty-one billion, one hundred twelve million, two hundred forty-one thousand, one hundred eleven".