1555012031117 has 2 divisors, whose sum is σ = 1555012031118. Its totient is φ = 1555012031116.

The previous prime is 1555012031087. The next prime is 1555012031143. The reversal of 1555012031117 is 7111302105551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 955361585476 + 599650445641 = 977426^2 + 774371^2 .

It is a cyclic number.

It is not a de Polignac number, because 1555012031117 - 2²⁶ = 1554944922253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1555012031197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 777506015558 + 777506015559.

It is an arithmetic number, because the mean of its divisors is an integer number (777506015559).

Almost surely, 2^{1555012031117} is an apocalyptic number.

It is an amenable number.

1555012031117 is a deficient number, since it is larger than the sum of its proper divisors (1).

1555012031117 is an equidigital number, since it uses as much as digits as its factorization.

1555012031117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5250, while the sum is 32.

Adding to 1555012031117 its reverse (7111302105551), we get a palindrome (8666314136668).

The spelling of 1555012031117 in words is "one trillion, five hundred fifty-five billion, twelve million, thirty-one thousand, one hundred seventeen".