1381591271 has 2 divisors, whose sum is σ = 1381591272. Its totient is φ = 1381591270.

The previous prime is 1381591243. The next prime is 1381591279. The reversal of 1381591271 is 1721951831.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1381591271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1381591279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 690795635 + 690795636.

It is an arithmetic number, because the mean of its divisors is an integer number (690795636).

Almost surely, 2^1381591271 is an apocalyptic number.

1381591271 is a deficient number, since it is larger than the sum of its proper divisors (1).

1381591271 is an equidigital number, since it uses as much as digits as its factorization.

1381591271 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 38.

The square root of 1381591271 is about 37169.7628590767. The cubic root of 1381591271 is about 1113.7640446189.

The spelling of 1381591271 in words is "one billion, three hundred eighty-one million, five hundred ninety-one thousand, two hundred seventy-one".