1388647097 has 2 divisors, whose sum is σ = 1388647098. Its totient is φ = 1388647096.

The previous prime is 1388647093. The next prime is 1388647151. The reversal of 1388647097 is 7907468831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1283358976 + 105288121 = 35824^2 + 10261^2 .

It is a cyclic number.

It is not a de Polignac number, because 1388647097 - 2² = 1388647093 is a prime.

It is a super-3 number, since 3×1388647097³ (a number of 28 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1388647093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 694323548 + 694323549.

It is an arithmetic number, because the mean of its divisors is an integer number (694323549).

Almost surely, 2^1388647097 is an apocalyptic number.

It is an amenable number.

1388647097 is a deficient number, since it is larger than the sum of its proper divisors (1).

1388647097 is an equidigital number, since it uses as much as digits as its factorization.

1388647097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2032128, while the sum is 53.

The square root of 1388647097 is about 37264.5555051982. Note that the first 4 decimals coincide. The cubic root of 1388647097 is about 1115.6568343297.

The spelling of 1388647097 in words is "one billion, three hundred eighty-eight million, six hundred forty-seven thousand, ninety-seven".