1138722857 has 2 divisors, whose sum is σ = 1138722858. Its totient is φ = 1138722856.

The previous prime is 1138722811. The next prime is 1138722859. The reversal of 1138722857 is 7582278311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 864124816 + 274598041 = 29396^2 + 16571^2 .

It is a cyclic number.

It is not a de Polignac number, because 1138722857 - 2⁸ = 1138722601 is a prime.

Together with 1138722859, 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 (1138722859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 569361428 + 569361429.

It is an arithmetic number, because the mean of its divisors is an integer number (569361429).

Almost surely, 2^1138722857 is an apocalyptic number.

It is an amenable number.

1138722857 is a deficient number, since it is larger than the sum of its proper divisors (1).

1138722857 is an equidigital number, since it uses as much as digits as its factorization.

1138722857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 188160, while the sum is 44.

The square root of 1138722857 is about 33744.9678767072. The cubic root of 1138722857 is about 1044.2536758840.

The spelling of 1138722857 in words is "one billion, one hundred thirty-eight million, seven hundred twenty-two thousand, eight hundred fifty-seven".