1587431717173 has 2 divisors, whose sum is σ = 1587431717174. Its totient is φ = 1587431717172.

The previous prime is 1587431717093. The next prime is 1587431717213. The reversal of 1587431717173 is 3717171347851.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1583427105649 + 4004611524 = 1258343^2 + 63282^2 .

It is a cyclic number.

It is not a de Polignac number, because 1587431717173 - 2¹⁷ = 1587431586101 is a prime.

It is a super-2 number, since 2×1587431717173² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1587434717173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 793715858586 + 793715858587.

It is an arithmetic number, because the mean of its divisors is an integer number (793715858587).

Almost surely, 2^{1587431717173} is an apocalyptic number.

It is an amenable number.

1587431717173 is a deficient number, since it is larger than the sum of its proper divisors (1).

1587431717173 is an equidigital number, since it uses as much as digits as its factorization.

1587431717173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3457440, while the sum is 55.

The spelling of 1587431717173 in words is "one trillion, five hundred eighty-seven billion, four hundred thirty-one million, seven hundred seventeen thousand, one hundred seventy-three".