1381979371 has 2 divisors, whose sum is σ = 1381979372. Its totient is φ = 1381979370.

The previous prime is 1381979327. The next prime is 1381979377. The reversal of 1381979371 is 1739791831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1381979371 - 2¹¹ = 1381977323 is a prime.

It is not a weakly prime, because it can be changed into another prime (1381979377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 690989685 + 690989686.

It is an arithmetic number, because the mean of its divisors is an integer number (690989686).

Almost surely, 2^1381979371 is an apocalyptic number.

1381979371 is a deficient number, since it is larger than the sum of its proper divisors (1).

1381979371 is an equidigital number, since it uses as much as digits as its factorization.

1381979371 is an evil number, because the sum of its binary digits is even.

The product of its digits is 285768, while the sum is 49.

The square root of 1381979371 is about 37174.9831338227. The cubic root of 1381979371 is about 1113.8683232544.

The spelling of 1381979371 in words is "one billion, three hundred eighty-one million, nine hundred seventy-nine thousand, three hundred seventy-one".