1213481 has 2 divisors, whose sum is σ = 1213482. Its totient is φ = 1213480.

The previous prime is 1213469. The next prime is 1213483. The reversal of 1213481 is 1843121.

1213481 is nontrivially palindromic in base 2.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1210000 + 3481 = 1100^2 + 59^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1213481 is a prime.

It is a super-2 number, since 2×1213481² = 2945072274722, which contains 22 as substring.

Together with 1213483, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1213483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606740 + 606741.

It is an arithmetic number, because the mean of its divisors is an integer number (606741).

2^1213481 is an apocalyptic number.

It is an amenable number.

1213481 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213481 is an equidigital number, since it uses as much as digits as its factorization.

1213481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 192, while the sum is 20.

The square root of 1213481 is about 1101.5811363672. The cubic root of 1213481 is about 106.6623121052.

It can be divided in two parts, 121 and 3481, that multiplied together give a square (421201 = 649²).

The spelling of 1213481 in words is "one million, two hundred thirteen thousand, four hundred eighty-one".