1555012031387 has 2 divisors, whose sum is σ = 1555012031388. Its totient is φ = 1555012031386.

The previous prime is 1555012031281. The next prime is 1555012031393. The reversal of 1555012031387 is 7831302105551.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1555012031387 is a prime.

It is not a weakly prime, because it can be changed into another prime (1555012031087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 777506015693 + 777506015694.

It is an arithmetic number, because the mean of its divisors is an integer number (777506015694).

Almost surely, 2^{1555012031387} is an apocalyptic number.

1555012031387 is a deficient number, since it is larger than the sum of its proper divisors (1).

1555012031387 is an equidigital number, since it uses as much as digits as its factorization.

1555012031387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 126000, while the sum is 41.

The spelling of 1555012031387 in words is "one trillion, five hundred fifty-five billion, twelve million, thirty-one thousand, three hundred eighty-seven".