1285385677 has 2 divisors, whose sum is σ = 1285385678. Its totient is φ = 1285385676.

The previous prime is 1285385653. The next prime is 1285385707. The reversal of 1285385677 is 7765835821.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1282069636 + 3316041 = 35806^2 + 1821^2 .

It is a cyclic number.

It is not a de Polignac number, because 1285385677 - 2¹¹ = 1285383629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1285385617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 642692838 + 642692839.

It is an arithmetic number, because the mean of its divisors is an integer number (642692839).

Almost surely, 2^1285385677 is an apocalyptic number.

It is an amenable number.

1285385677 is a deficient number, since it is larger than the sum of its proper divisors (1).

1285385677 is an equidigital number, since it uses as much as digits as its factorization.

1285385677 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2822400, while the sum is 52.

The square root of 1285385677 is about 35852.2757576140. The cubic root of 1285385677 is about 1087.2877258996.

The spelling of 1285385677 in words is "one billion, two hundred eighty-five million, three hundred eighty-five thousand, six hundred seventy-seven".