1687772741 has 2 divisors, whose sum is σ = 1687772742. Its totient is φ = 1687772740.

The previous prime is 1687772719. The next prime is 1687772759. The reversal of 1687772741 is 1472777861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1660888516 + 26884225 = 40754^2 + 5185^2 .

It is a cyclic number.

It is not a de Polignac number, because 1687772741 - 2²² = 1683578437 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1687772741.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1687772701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 843886370 + 843886371.

It is an arithmetic number, because the mean of its divisors is an integer number (843886371).

Almost surely, 2^1687772741 is an apocalyptic number.

It is an amenable number.

1687772741 is a deficient number, since it is larger than the sum of its proper divisors (1).

1687772741 is an equidigital number, since it uses as much as digits as its factorization.

1687772741 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 921984, while the sum is 50.

The square root of 1687772741 is about 41082.5113764969. The cubic root of 1687772741 is about 1190.6149261654.

The spelling of 1687772741 in words is "one billion, six hundred eighty-seven million, seven hundred seventy-two thousand, seven hundred forty-one".