1213401131 has 2 divisors, whose sum is σ = 1213401132. Its totient is φ = 1213401130.

The previous prime is 1213401127. The next prime is 1213401143. The reversal of 1213401131 is 1311043121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1213401131 - 2² = 1213401127 is a prime.

It is a super-2 number, since 2×1213401131² = 2944684609424158322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1213401181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606700565 + 606700566.

It is an arithmetic number, because the mean of its divisors is an integer number (606700566).

Almost surely, 2^1213401131 is an apocalyptic number.

1213401131 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213401131 is an equidigital number, since it uses as much as digits as its factorization.

1213401131 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1213401131 is about 34833.9077767626. The cubic root of 1213401131 is about 1066.5997195071.

Adding to 1213401131 its reverse (1311043121), we get a palindrome (2524444252).

The spelling of 1213401131 in words is "one billion, two hundred thirteen million, four hundred one thousand, one hundred thirty-one".