1213231331 has 8 divisors (see below), whose sum is σ = 1314574800. Its totient is φ = 1113033312.

The previous prime is 1213231319. The next prime is 1213231343. The reversal of 1213231331 is 1331323121.

It is an interprime number because it is at equal distance from previous prime (1213231319) and next prime (1213231343).

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1213231331 is a prime.

It is a super-2 number, since 2×1213231331² = 2943860525040063122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213231631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 284156 + ... + 288393.

It is an arithmetic number, because the mean of its divisors is an integer number (164321850).

Almost surely, 2^1213231331 is an apocalyptic number.

1213231331 is a deficient number, since it is larger than the sum of its proper divisors (101343469).

1213231331 is a wasteful number, since it uses less digits than its factorization.

1213231331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 572725.

The product of its digits is 324, while the sum is 20.

The square root of 1213231331 is about 34831.4704111095. The cubic root of 1213231331 is about 1066.5499648474.

Adding to 1213231331 its reverse (1331323121), we get a palindrome (2544554452).

The spelling of 1213231331 in words is "one billion, two hundred thirteen million, two hundred thirty-one thousand, three hundred thirty-one".