1211311023 has 32 divisors (see below), whose sum is σ = 1770720000. Its totient is φ = 732036096.

The previous prime is 1211311021. The next prime is 1211311027. The reversal of 1211311023 is 3201131121.

It is a happy number.

It is not a de Polignac number, because 1211311023 - 2¹ = 1211311021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1211310993 and 1211311011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211311021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1303423 + ... + 1304351.

It is an arithmetic number, because the mean of its divisors is an integer number (55335000).

Almost surely, 2^1211311023 is an apocalyptic number.

1211311023 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1211311023 is a deficient number, since it is larger than the sum of its proper divisors (559408977).

1211311023 is a wasteful number, since it uses less digits than its factorization.

1211311023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1511.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 1211311023 is about 34803.8937907815. The cubic root of 1211311023 is about 1065.9869543393.

Adding to 1211311023 its reverse (3201131121), we get a palindrome (4412442144).

The spelling of 1211311023 in words is "one billion, two hundred eleven million, three hundred eleven thousand, twenty-three".