1213132331 has 4 divisors (see below), whose sum is σ = 1252265664. Its totient is φ = 1173999000.

The previous prime is 1213132301. The next prime is 1213132337. The reversal of 1213132331 is 1332313121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1332313121 = 1433 ⋅929737.

It is a cyclic number.

It is not a de Polignac number, because 1213132331 - 2⁶ = 1213132267 is a prime.

It is a super-2 number, since 2×1213132331² = 2943380105034987122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213132337) 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, 19566620 + ... + 19566681.

It is an arithmetic number, because the mean of its divisors is an integer number (313066416).

Almost surely, 2^1213132331 is an apocalyptic number.

1213132331 is a deficient number, since it is larger than the sum of its proper divisors (39133333).

1213132331 is an equidigital number, since it uses as much as digits as its factorization.

1213132331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39133332.

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

The square root of 1213132331 is about 34830.0492534823. The cubic root of 1213132331 is about 1066.5209538045.

Adding to 1213132331 its reverse (1332313121), we get a palindrome (2545445452).

The spelling of 1213132331 in words is "one billion, two hundred thirteen million, one hundred thirty-two thousand, three hundred thirty-one".