1285717392829 has 2 divisors, whose sum is σ = 1285717392830. Its totient is φ = 1285717392828.

The previous prime is 1285717392787. The next prime is 1285717392847. The reversal of 1285717392829 is 9282937175821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 764033328100 + 521684064729 = 874090^2 + 722277^2 .

It is an emirp because it is prime and its reverse (9282937175821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1285717392829 - 2¹⁵ = 1285717360061 is a prime.

It is a super-2 number, since 2×1285717392829² (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 (1285717392929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 642858696414 + 642858696415.

It is an arithmetic number, because the mean of its divisors is an integer number (642858696415).

Almost surely, 2^{1285717392829} is an apocalyptic number.

It is an amenable number.

1285717392829 is a deficient number, since it is larger than the sum of its proper divisors (1).

1285717392829 is an equidigital number, since it uses as much as digits as its factorization.

1285717392829 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30481920, while the sum is 64.

The spelling of 1285717392829 in words is "one trillion, two hundred eighty-five billion, seven hundred seventeen million, three hundred ninety-two thousand, eight hundred twenty-nine".