1244123551 has 4 divisors (see below), whose sum is σ = 1357225704. Its totient is φ = 1131021400.

The previous prime is 1244123533. The next prime is 1244123611. The reversal of 1244123551 is 1553214421.

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

It is a cyclic number.

It is not a de Polignac number, because 1244123551 - 2¹⁹ = 1243599263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1244123051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56551060 + ... + 56551081.

It is an arithmetic number, because the mean of its divisors is an integer number (339306426).

Almost surely, 2^1244123551 is an apocalyptic number.

1244123551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1244123551 is a deficient number, since it is larger than the sum of its proper divisors (113102153).

1244123551 is a wasteful number, since it uses less digits than its factorization.

1244123551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113102152.

The product of its digits is 4800, while the sum is 28.

The square root of 1244123551 is about 35272.1356172262. The cubic root of 1244123551 is about 1075.5266360669.

Adding to 1244123551 its reverse (1553214421), we get a palindrome (2797337972).

The spelling of 1244123551 in words is "one billion, two hundred forty-four million, one hundred twenty-three thousand, five hundred fifty-one".