690071111 has 2 divisors, whose sum is σ = 690071112. Its totient is φ = 690071110.

The previous prime is 690071059. The next prime is 690071113. The reversal of 690071111 is 111170096.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-690071111 is a prime.

Together with 690071113, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (690071113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345035555 + 345035556.

It is an arithmetic number, because the mean of its divisors is an integer number (345035556).

Almost surely, 2^690071111 is an apocalyptic number.

690071111 is a deficient number, since it is larger than the sum of its proper divisors (1).

690071111 is an equidigital number, since it uses as much as digits as its factorization.

690071111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 378, while the sum is 26.

The square root of 690071111 is about 26269.2046130065. The cubic root of 690071111 is about 883.6859475419.

The spelling of 690071111 in words is "six hundred ninety million, seventy-one thousand, one hundred eleven".