1681457111 has 2 divisors, whose sum is σ = 1681457112. Its totient is φ = 1681457110.

The previous prime is 1681457087. The next prime is 1681457123. The reversal of 1681457111 is 1117541861.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1681457111 - 2⁶ = 1681457047 is a prime.

It is a super-2 number, since 2×1681457111² = 5654596032264932642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1681451111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840728555 + 840728556.

It is an arithmetic number, because the mean of its divisors is an integer number (840728556).

Almost surely, 2^1681457111 is an apocalyptic number.

1681457111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1681457111 is an equidigital number, since it uses as much as digits as its factorization.

1681457111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6720, while the sum is 35.

The square root of 1681457111 is about 41005.5741454744. The cubic root of 1681457111 is about 1189.1279798901.

Adding to 1681457111 its reverse (1117541861), we get a palindrome (2798998972).

The spelling of 1681457111 in words is "one billion, six hundred eighty-one million, four hundred fifty-seven thousand, one hundred eleven".