1687079081 has 2 divisors, whose sum is σ = 1687079082. Its totient is φ = 1687079080.

The previous prime is 1687079033. The next prime is 1687079087. The reversal of 1687079081 is 1809707861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1677721600 + 9357481 = 40960^2 + 3059^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1687079081 is a prime.

It is a super-2 number, since 2×1687079081² = 5692471651095609122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1687079087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 843539540 + 843539541.

It is an arithmetic number, because the mean of its divisors is an integer number (843539541).

Almost surely, 2^1687079081 is an apocalyptic number.

It is an amenable number.

1687079081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1687079081 is an equidigital number, since it uses as much as digits as its factorization.

1687079081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 169344, while the sum is 47.

The square root of 1687079081 is about 41074.0682304541. The cubic root of 1687079081 is about 1190.4517930020.

The spelling of 1687079081 in words is "one billion, six hundred eighty-seven million, seventy-nine thousand, eighty-one".