1231444445 has 16 divisors (see below), whose sum is σ = 1842369408. Its totient is φ = 767653440.

The previous prime is 1231444441. The next prime is 1231444477. The reversal of 1231444445 is 5444441321.

It is not a de Polignac number, because 1231444445 - 2² = 1231444441 is a prime.

It is a super-2 number, since 2×1231444445² = 3032910842242716050, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231444441) 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 15 ways as a sum of consecutive naturals, for example, 1598894 + ... + 1599663.

It is an arithmetic number, because the mean of its divisors is an integer number (115148088).

Almost surely, 2^1231444445 is an apocalyptic number.

It is an amenable number.

1231444445 is a deficient number, since it is larger than the sum of its proper divisors (610924963).

1231444445 is a wasteful number, since it uses less digits than its factorization.

1231444445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3198580.

The product of its digits is 30720, while the sum is 32.

The square root of 1231444445 is about 35091.9427361895. The cubic root of 1231444445 is about 1071.8605197068.

Adding to 1231444445 its reverse (5444441321), we get a palindrome (6675885766).

The spelling of 1231444445 in words is "one billion, two hundred thirty-one million, four hundred forty-four thousand, four hundred forty-five".