1371221209 has 2 divisors, whose sum is σ = 1371221210. Its totient is φ = 1371221208.

The previous prime is 1371221167. The next prime is 1371221251. The reversal of 1371221209 is 9021221731.

It is a balanced prime because it is at equal distance from previous prime (1371221167) and next prime (1371221251).

It can be written as a sum of positive squares in only one way, i.e., 825297984 + 545923225 = 28728^2 + 23365^2 .

It is a cyclic number.

It is not a de Polignac number, because 1371221209 - 2¹³ = 1371213017 is a prime.

It is a super-2 number, since 2×1371221209² = 3760495208022843362, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1371221809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 685610604 + 685610605.

It is an arithmetic number, because the mean of its divisors is an integer number (685610605).

Almost surely, 2^1371221209 is an apocalyptic number.

It is an amenable number.

1371221209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1371221209 is an equidigital number, since it uses as much as digits as its factorization.

1371221209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 1371221209 is about 37030.0041722925. The cubic root of 1371221209 is about 1110.9704493643.

The spelling of 1371221209 in words is "one billion, three hundred seventy-one million, two hundred twenty-one thousand, two hundred nine".