1391216213 has 2 divisors, whose sum is σ = 1391216214. Its totient is φ = 1391216212.

The previous prime is 1391216191. The next prime is 1391216219. The reversal of 1391216213 is 3126121931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1378414129 + 12802084 = 37127^2 + 3578^2 .

It is a cyclic number.

It is not a de Polignac number, because 1391216213 - 2¹⁴ = 1391199829 is a prime.

It is a super-2 number, since 2×1391216213² = 3870965102628122738, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1391216219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695608106 + 695608107.

It is an arithmetic number, because the mean of its divisors is an integer number (695608107).

Almost surely, 2^1391216213 is an apocalyptic number.

It is an amenable number.

1391216213 is a deficient number, since it is larger than the sum of its proper divisors (1).

1391216213 is an equidigital number, since it uses as much as digits as its factorization.

1391216213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944, while the sum is 29.

The square root of 1391216213 is about 37299.0108850087. The cubic root of 1391216213 is about 1116.3444306818.

The spelling of 1391216213 in words is "one billion, three hundred ninety-one million, two hundred sixteen thousand, two hundred thirteen".