1213531023 has 8 divisors (see below), whose sum is σ = 1652467968. Its totient is φ = 791807384.

The previous prime is 1213531003. The next prime is 1213531031. The reversal of 1213531023 is 3201353121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1213531023 - 2⁶ = 1213530959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213531003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4303161 + ... + 4303442.

It is an arithmetic number, because the mean of its divisors is an integer number (206558496).

Almost surely, 2^1213531023 is an apocalyptic number.

1213531023 is a deficient number, since it is larger than the sum of its proper divisors (438936945).

1213531023 is an equidigital number, since it uses as much as digits as its factorization.

1213531023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8606653.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 1213531023 is about 34835.7721745909. The cubic root of 1213531023 is about 1066.6377772232.

Adding to 1213531023 its reverse (3201353121), we get a palindrome (4414884144).

The spelling of 1213531023 in words is "one billion, two hundred thirteen million, five hundred thirty-one thousand, twenty-three".