1389566897 has 2 divisors, whose sum is σ = 1389566898. Its totient is φ = 1389566896.

The previous prime is 1389566837. The next prime is 1389566903. The reversal of 1389566897 is 7986659831.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1210970401 + 178596496 = 34799^2 + 13364^2 .

It is a cyclic number.

It is not a de Polignac number, because 1389566897 - 2¹⁶ = 1389501361 is a prime.

It is a super-2 number, since 2×1389566897² = 3861792322476417218, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1389566837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 694783448 + 694783449.

It is an arithmetic number, because the mean of its divisors is an integer number (694783449).

Almost surely, 2^1389566897 is an apocalyptic number.

It is an amenable number.

1389566897 is a deficient number, since it is larger than the sum of its proper divisors (1).

1389566897 is an equidigital number, since it uses as much as digits as its factorization.

1389566897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19595520, while the sum is 62.

The square root of 1389566897 is about 37276.8949484798. The cubic root of 1389566897 is about 1115.9031063237.

The spelling of 1389566897 in words is "one billion, three hundred eighty-nine million, five hundred sixty-six thousand, eight hundred ninety-seven".