1397774142857 has 2 divisors, whose sum is σ = 1397774142858. Its totient is φ = 1397774142856.

The previous prime is 1397774142847. The next prime is 1397774142859. The reversal of 1397774142857 is 7582414777931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1380650850121 + 17123292736 = 1175011^2 + 130856^2 .

It is a cyclic number.

It is not a de Polignac number, because 1397774142857 - 2¹⁶ = 1397774077321 is a prime.

Together with 1397774142859, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1397774142793 and 1397774142802.

It is not a weakly prime, because it can be changed into another prime (1397774142859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 698887071428 + 698887071429.

It is an arithmetic number, because the mean of its divisors is an integer number (698887071429).

Almost surely, 2^{1397774142857} is an apocalyptic number.

It is an amenable number.

1397774142857 is a deficient number, since it is larger than the sum of its proper divisors (1).

1397774142857 is an equidigital number, since it uses as much as digits as its factorization.

1397774142857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82978560, while the sum is 65.

The spelling of 1397774142857 in words is "one trillion, three hundred ninety-seven billion, seven hundred seventy-four million, one hundred forty-two thousand, eight hundred fifty-seven".