1213531143 has 24 divisors (see below), whose sum is σ = 1826596464. Its totient is φ = 715587840.

The previous prime is 1213531139. The next prime is 1213531147. The reversal of 1213531143 is 3411353121.

It is an interprime number because it is at equal distance from previous prime (1213531139) and next prime (1213531147).

It is not a de Polignac number, because 1213531143 - 2² = 1213531139 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213531147) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31746 + ... + 58607.

It is an arithmetic number, because the mean of its divisors is an integer number (76108186).

Almost surely, 2^1213531143 is an apocalyptic number.

1213531143 is a deficient number, since it is larger than the sum of its proper divisors (613065321).

1213531143 is a wasteful number, since it uses less digits than its factorization.

1213531143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90415 (or 90404 counting only the distinct ones).

The product of its digits is 1080, while the sum is 24.

The square root of 1213531143 is about 34835.7738969583. The cubic root of 1213531143 is about 1066.6378123814.

Adding to 1213531143 its reverse (3411353121), we get a palindrome (4624884264).

The spelling of 1213531143 in words is "one billion, two hundred thirteen million, five hundred thirty-one thousand, one hundred forty-three".