1381685497 has 2 divisors, whose sum is σ = 1381685498. Its totient is φ = 1381685496.

The previous prime is 1381685447. The next prime is 1381685507. The reversal of 1381685497 is 7945861831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1164447376 + 217238121 = 34124^2 + 14739^2 .

It is a cyclic number.

It is not a de Polignac number, because 1381685497 - 2⁷ = 1381685369 is a prime.

It is not a weakly prime, because it can be changed into another prime (1381685447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 690842748 + 690842749.

It is an arithmetic number, because the mean of its divisors is an integer number (690842749).

Almost surely, 2^1381685497 is an apocalyptic number.

It is an amenable number.

1381685497 is a deficient number, since it is larger than the sum of its proper divisors (1).

1381685497 is an equidigital number, since it uses as much as digits as its factorization.

1381685497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1451520, while the sum is 52.

The square root of 1381685497 is about 37171.0303462253. The cubic root of 1381685497 is about 1113.7893640090.

The spelling of 1381685497 in words is "one billion, three hundred eighty-one million, six hundred eighty-five thousand, four hundred ninety-seven".