1985280677 has 2 divisors, whose sum is σ = 1985280678. Its totient is φ = 1985280676.

The previous prime is 1985280659. The next prime is 1985280697. The reversal of 1985280677 is 7760825891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1365967681 + 619312996 = 36959^2 + 24886^2 .

It is a cyclic number.

It is not a de Polignac number, because 1985280677 - 2¹² = 1985276581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1985280697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 992640338 + 992640339.

It is an arithmetic number, because the mean of its divisors is an integer number (992640339).

Almost surely, 2^1985280677 is an apocalyptic number.

It is an amenable number.

1985280677 is a deficient number, since it is larger than the sum of its proper divisors (1).

1985280677 is an equidigital number, since it uses as much as digits as its factorization.

1985280677 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1693440, while the sum is 53.

The square root of 1985280677 is about 44556.4886071602. The cubic root of 1985280677 is about 1256.8225720198.

The spelling of 1985280677 in words is "one billion, nine hundred eighty-five million, two hundred eighty thousand, six hundred seventy-seven".