1231123355 has 16 divisors (see below), whose sum is σ = 1841889024. Its totient is φ = 767453280.

The previous prime is 1231123351. The next prime is 1231123403. The reversal of 1231123355 is 5533211321.

It is not a de Polignac number, because 1231123355 - 2² = 1231123351 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231123351) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1598477 + ... + 1599246.

It is an arithmetic number, because the mean of its divisors is an integer number (115118064).

Almost surely, 2^1231123355 is an apocalyptic number.

1231123355 is a deficient number, since it is larger than the sum of its proper divisors (610765669).

1231123355 is a wasteful number, since it uses less digits than its factorization.

1231123355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3197746.

The product of its digits is 2700, while the sum is 26.

The square root of 1231123355 is about 35087.3674561088. The cubic root of 1231123355 is about 1071.7673517168.

Adding to 1231123355 its reverse (5533211321), we get a palindrome (6764334676).

The spelling of 1231123355 in words is "one billion, two hundred thirty-one million, one hundred twenty-three thousand, three hundred fifty-five".