1387157773 has 2 divisors, whose sum is σ = 1387157774. Its totient is φ = 1387157772.

The previous prime is 1387157771. The next prime is 1387157777. The reversal of 1387157773 is 3777517831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 967645449 + 419512324 = 31107^2 + 20482^2 .

It is a cyclic number.

It is not a de Polignac number, because 1387157773 - 2¹ = 1387157771 is a prime.

Together with 1387157771, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1387157771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 693578886 + 693578887.

It is an arithmetic number, because the mean of its divisors is an integer number (693578887).

Almost surely, 2^1387157773 is an apocalyptic number.

It is an amenable number.

1387157773 is a deficient number, since it is larger than the sum of its proper divisors (1).

1387157773 is an equidigital number, since it uses as much as digits as its factorization.

1387157773 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864360, while the sum is 49.

The square root of 1387157773 is about 37244.5670266148. The cubic root of 1387157773 is about 1115.2578443416.

The spelling of 1387157773 in words is "one billion, three hundred eighty-seven million, one hundred fifty-seven thousand, seven hundred seventy-three".