1213232131 has 4 divisors (see below), whose sum is σ = 1214094600. Its totient is φ = 1212369664.

The previous prime is 1213232113. The next prime is 1213232179. The reversal of 1213232131 is 1312323121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1213232131 - 2¹³ = 1213223939 is a prime.

It is a super-2 number, since 2×1213232131² = 2943864407381602322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1213232099 and 1213232108.

It is not an unprimeable number, because it can be changed into a prime (1213232431) 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, 429121 + ... + 431938.

It is an arithmetic number, because the mean of its divisors is an integer number (303523650).

Almost surely, 2^1213232131 is an apocalyptic number.

1213232131 is a deficient number, since it is larger than the sum of its proper divisors (862469).

1213232131 is an equidigital number, since it uses as much as digits as its factorization.

1213232131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 862468.

The product of its digits is 216, while the sum is 19.

The square root of 1213232131 is about 34831.4818949754. The cubic root of 1213232131 is about 1066.5501992736.

Adding to 1213232131 its reverse (1312323121), we get a palindrome (2525555252).

The spelling of 1213232131 in words is "one billion, two hundred thirteen million, two hundred thirty-two thousand, one hundred thirty-one".