1312221131 has 8 divisors (see below), whose sum is σ = 1415334480. Its totient is φ = 1209418272.

The previous prime is 1312221083. The next prime is 1312221151. The reversal of 1312221131 is 1311222131.

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 1312221131 - 2²² = 1308026827 is a prime.

It is a super-2 number, since 2×1312221131² = 3443848593285838322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1312221151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68801 + ... + 85778.

It is an arithmetic number, because the mean of its divisors is an integer number (176916810).

Almost surely, 2^1312221131 is an apocalyptic number.

1312221131 is a deficient number, since it is larger than the sum of its proper divisors (103113349).

1312221131 is a wasteful number, since it uses less digits than its factorization.

1312221131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155245.

The product of its digits is 72, while the sum is 17.

The square root of 1312221131 is about 36224.5929031646. The cubic root of 1312221131 is about 1094.8022358525.

Adding to 1312221131 its reverse (1311222131), we get a palindrome (2623443262).

The spelling of 1312221131 in words is "one billion, three hundred twelve million, two hundred twenty-one thousand, one hundred thirty-one".