697734109 has 2 divisors, whose sum is σ = 697734110. Its totient is φ = 697734108.

The previous prime is 697734061. The next prime is 697734157. The reversal of 697734109 is 901437796.

It is a balanced prime because it is at equal distance from previous prime (697734061) and next prime (697734157).

It can be written as a sum of positive squares in only one way, i.e., 457018884 + 240715225 = 21378^2 + 15515^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-697734109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (697732109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 348867054 + 348867055.

It is an arithmetic number, because the mean of its divisors is an integer number (348867055).

Almost surely, 2^697734109 is an apocalyptic number.

It is an amenable number.

697734109 is a deficient number, since it is larger than the sum of its proper divisors (1).

697734109 is an equidigital number, since it uses as much as digits as its factorization.

697734109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 285768, while the sum is 46.

The square root of 697734109 is about 26414.6570865495. The cubic root of 697734109 is about 886.9449215410.

The spelling of 697734109 in words is "six hundred ninety-seven million, seven hundred thirty-four thousand, one hundred nine".