1231355445 has 16 divisors (see below), whose sum is σ = 1974435072. Its totient is φ = 655300800.

The previous prime is 1231355431. The next prime is 1231355467. The reversal of 1231355445 is 5445531321.

It is not a de Polignac number, because 1231355445 - 2¹⁷ = 1231224373 is a prime.

It is a super-2 number, since 2×1231355445² = 3032472463862296050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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, 81706 + ... + 95595.

It is an arithmetic number, because the mean of its divisors is an integer number (123402192).

Almost surely, 2^1231355445 is an apocalyptic number.

1231355445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1231355445 is a deficient number, since it is larger than the sum of its proper divisors (743079627).

1231355445 is a wasteful number, since it uses less digits than its factorization.

1231355445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177772.

The product of its digits is 36000, while the sum is 33.

The square root of 1231355445 is about 35090.6746159147. The cubic root of 1231355445 is about 1071.8346969464.

Adding to 1231355445 its reverse (5445531321), we get a palindrome (6676886766).

The spelling of 1231355445 in words is "one billion, two hundred thirty-one million, three hundred fifty-five thousand, four hundred forty-five".