1387025617 has 2 divisors, whose sum is σ = 1387025618. Its totient is φ = 1387025616.

The previous prime is 1387025609. The next prime is 1387025621. The reversal of 1387025617 is 7165207831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1000077376 + 386948241 = 31624^2 + 19671^2 .

It is a cyclic number.

It is not a de Polignac number, because 1387025617 - 2³ = 1387025609 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1387025617.

It is not a weakly prime, because it can be changed into another prime (1387025677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 693512808 + 693512809.

It is an arithmetic number, because the mean of its divisors is an integer number (693512809).

Almost surely, 2^1387025617 is an apocalyptic number.

It is an amenable number.

1387025617 is a deficient number, since it is larger than the sum of its proper divisors (1).

1387025617 is an equidigital number, since it uses as much as digits as its factorization.

1387025617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 70560, while the sum is 40.

The square root of 1387025617 is about 37242.7928195510. The cubic root of 1387025617 is about 1115.2224259489. Note that the first 3 decimals are identical.

The spelling of 1387025617 in words is "one billion, three hundred eighty-seven million, twenty-five thousand, six hundred seventeen".