1213131023 has 4 divisors (see below), whose sum is σ = 1306448808. Its totient is φ = 1119813240.

The previous prime is 1213130983. The next prime is 1213131041. The reversal of 1213131023 is 3201313121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3201313121 = 23 ⋅139187527.

It is not a de Polignac number, because 1213131023 - 2⁸ = 1213130767 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1213130992 and 1213131010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213131223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46658873 + ... + 46658898.

It is an arithmetic number, because the mean of its divisors is an integer number (326612202).

Almost surely, 2^1213131023 is an apocalyptic number.

1213131023 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1213131023 is a deficient number, since it is larger than the sum of its proper divisors (93317785).

1213131023 is an equidigital number, since it uses as much as digits as its factorization.

1213131023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93317784.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1213131023 is about 34830.0304765873. The cubic root of 1213131023 is about 1066.5205704965.

Adding to 1213131023 its reverse (3201313121), we get a palindrome (4414444144).

The spelling of 1213131023 in words is "one billion, two hundred thirteen million, one hundred thirty-one thousand, twenty-three".