1371231109 has 2 divisors, whose sum is σ = 1371231110. Its totient is φ = 1371231108.

The previous prime is 1371231073. The next prime is 1371231167. The reversal of 1371231109 is 9011321731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1280924100 + 90307009 = 35790^2 + 9503^2 .

It is a cyclic number.

It is not a de Polignac number, because 1371231109 - 2⁷ = 1371230981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1371231209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 685615554 + 685615555.

It is an arithmetic number, because the mean of its divisors is an integer number (685615555).

Almost surely, 2^1371231109 is an apocalyptic number.

It is an amenable number.

1371231109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1371231109 is an equidigital number, since it uses as much as digits as its factorization.

1371231109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1134, while the sum is 28.

The square root of 1371231109 is about 37030.1378474345. The cubic root of 1371231109 is about 1110.9731230348.

The spelling of 1371231109 in words is "one billion, three hundred seventy-one million, two hundred thirty-one thousand, one hundred nine".