1387205851 has 2 divisors, whose sum is σ = 1387205852. Its totient is φ = 1387205850.

The previous prime is 1387205839. The next prime is 1387205857. The reversal of 1387205851 is 1585027831.

It is a strong prime.

It is an emirp because it is prime and its reverse (1585027831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1387205851 - 2¹¹ = 1387203803 is a prime.

It is not a weakly prime, because it can be changed into another prime (1387205857) 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, 693602925 + 693602926.

It is an arithmetic number, because the mean of its divisors is an integer number (693602926).

Almost surely, 2^1387205851 is an apocalyptic number.

1387205851 is a deficient number, since it is larger than the sum of its proper divisors (1).

1387205851 is an equidigital number, since it uses as much as digits as its factorization.

1387205851 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 67200, while the sum is 40.

The square root of 1387205851 is about 37245.2124574421. The cubic root of 1387205851 is about 1115.2707289003.

The spelling of 1387205851 in words is "one billion, three hundred eighty-seven million, two hundred five thousand, eight hundred fifty-one".