1301685857 has 2 divisors, whose sum is σ = 1301685858. Its totient is φ = 1301685856.

The previous prime is 1301685841. The next prime is 1301685859. The reversal of 1301685857 is 7585861031.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 930006016 + 371679841 = 30496^2 + 19279^2 .

It is a cyclic number.

It is not a de Polignac number, because 1301685857 - 2⁴ = 1301685841 is a prime.

Together with 1301685859, 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 (1301685859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 650842928 + 650842929.

It is an arithmetic number, because the mean of its divisors is an integer number (650842929).

Almost surely, 2^1301685857 is an apocalyptic number.

It is an amenable number.

1301685857 is a deficient number, since it is larger than the sum of its proper divisors (1).

1301685857 is an equidigital number, since it uses as much as digits as its factorization.

1301685857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 201600, while the sum is 44.

The square root of 1301685857 is about 36078.8838103398. The cubic root of 1301685857 is about 1091.8644567931.

The spelling of 1301685857 in words is "one billion, three hundred one million, six hundred eighty-five thousand, eight hundred fifty-seven".