690947111 has 2 divisors, whose sum is σ = 690947112. Its totient is φ = 690947110.

The previous prime is 690947083. The next prime is 690947123. The reversal of 690947111 is 111749096.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-690947111 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (690947911) 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, 345473555 + 345473556.

It is an arithmetic number, because the mean of its divisors is an integer number (345473556).

Almost surely, 2^690947111 is an apocalyptic number.

690947111 is a deficient number, since it is larger than the sum of its proper divisors (1).

690947111 is an equidigital number, since it uses as much as digits as its factorization.

690947111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 38.

The square root of 690947111 is about 26285.8728407485. The cubic root of 690947111 is about 884.0597165388.

The spelling of 690947111 in words is "six hundred ninety million, nine hundred forty-seven thousand, one hundred eleven".