1381277771 has 2 divisors, whose sum is σ = 1381277772. Its totient is φ = 1381277770.

The previous prime is 1381277707. The next prime is 1381277773. The reversal of 1381277771 is 1777721831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1381277771 - 2⁶ = 1381277707 is a prime.

Together with 1381277773, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1381277773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 690638885 + 690638886.

It is an arithmetic number, because the mean of its divisors is an integer number (690638886).

Almost surely, 2^1381277771 is an apocalyptic number.

1381277771 is a deficient number, since it is larger than the sum of its proper divisors (1).

1381277771 is an equidigital number, since it uses as much as digits as its factorization.

1381277771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 115248, while the sum is 44.

The square root of 1381277771 is about 37165.5454823416. The cubic root of 1381277771 is about 1113.6797960067.

The spelling of 1381277771 in words is "one billion, three hundred eighty-one million, two hundred seventy-seven thousand, seven hundred seventy-one".